Clr_Cmos: How To Clear CMOS On Your Motherboard?

How To Clear CMOS On Your Motherboard?

Clearing your CMOS can help you with a wide array of problems.

It’s a well-known “workaround” that can help with things like hardware compatibility issues, inadequate BIOS settings, post-upgrade woes, and more.

If you’ve stumbled upon an issue that seems too tough to crack, don’t worry – chances are it’s nothing serious… nothing a good old “clear CMOS” method won’t be able to fix.

But, what is CMOS, is it safe to clear it, and should you clear it right away or look for other potential issues instead?

What is CMOS?

CMOS stands for complementary metal-oxide-semiconductor but is often referred to as CMOS RAM and RTC (real-time clock).

CMOS is an onboard, battery-powered chip that’s used inside computers for various things, including time and date settings, and system settings.

The standardized CMOS battery is the 3v CR2032, and it’s capable of lasting around ten years.

Of course, this depends on the use case but, in most scenarios, you will never have to change your CMOS battery.

How can you tell if your CMOS battery’s levels are nearly depleted? It’s simple – your PC won’t be able to keep time and date records or other BIOS settings you have set after shutdowns and your PC is likely to display several CMOS errors when booting up.

CMOS’ Aren’t the Same Anymore

Back in the old days of early IBM computers, CMOS’ were able to store 64 bytes of data in total.

14 bytes were used for time and date storage, and the remaining 50 were used for system settings storage.

We’re talking about low-level settings here, used to power up the board and initialize connected hardware and peripherals.

These days, however, motherboard manufacturers have moved the system (AKA BIOS) settings from CMOS to either the Southbridge or Super I/O chips.

But, if CMOS no longer stores system settings – what does clearing CMOS do in addition to resetting the time and date?

How to Clear CMOS / Reset BIOS?

The thing is, CMOS chips cannot store BIOS settings anymore.

These days, there’s a lot more data to be stored, and CMOS chips’ capacity simply isn’t sufficient.

Instead, board manufacturers now use NVRAM chips which not only have much higher capacity but store data persistently, even when there’s no power source connected to the board.

Even though the CMOS chip no longer stores BIOS settings, modern PCs still have CMOS batteries, and the term “clearing CMOS” is still used for resetting the BIOS.

Removing the CMOS Battery

Removing the CMOS battery is still the most common method used to clear CMOS and reset BIOS settings to default values.

This functionality has been kept because of tradition and nothing else.

People are so used to reset their BIOS by removing the CMOS battery that board manufacturers decided to keep this functionality in place.

But, several other ways are just as (perhaps even more) straightforward as this one.

Using the Reset Button

These days, mid and high-end boards typically have reset CMOS/BIOS buttons either on the board itself or the rear I/O.

Source: MSI

To initiate it, turn your system on and press the CMOS/BIOS reset button and you should be good to go. Some Motherboards want you to trigger the Button when the System is off. Consult your Manual if you’re unsure which one it is.

Using the Jumper

Most boards don’t have physical buttons for clearing CMOS.

But, the same thing can be done with the CMOS jumper. We’re referring to two or three pins located near the CMOS battery.

You’ll see either JBAT1 or CLEAR_CMOS written next to it directly on the Motherboard.

The JBAT1, which usually has only two pins, will clear CMOS if you place a jumper on it to short the two pins. (Use any other jumper on the Motherboard) Short the pins for a minute and replace the jumper where you took it from. (if you took it from other pins on the motherboard)

The CLEAR_CMOS, which usually has 3 pins, can be set up in positions 1-2 and 2-3. The default is the (usually) already present jumper on pins 1-2. Set the jumper to pins 2-3 to clear CMOS and after a minute, move it back to 1-2.

Resetting from the BIOS Menu

People tend to clear CMOS when they can’t even get into BIOS/UEFI.

If you can access your BIOS, though, and you still want to reset the settings, simply select the “Reset BIOS to (Factory) Default” option and that’s it.

Why Would You Need to Clear CMOS?

Here are the three main reasons why you might need to clear CMOS:

Troubleshoot Hardware Compatibility Issues

Clearing CMOS won’t give your system or motherboard performance benefits.

However, it can help you in the process of troubleshooting by resetting the system settings. This will help you get to the bottom of the problem much easier, especially after installing new hardware into your machine.

After Unsuccessful Overclocking Attempts

Additionally, overclocking enthusiasts might be familiar with the best CMOS clearing methods as they are sometimes the only way back after unsuccessful overclocking attempts.

Resetting BIOS settings to default will get rid of overenthusiastic overclock setups.

There are motherboards that can detect malfunctioning overclocking setups and reset BIOS settings back to factory values without you needing to do any manual labor.

The perks of having high-end boards, eh?

Reset System-Level Password

Another reason for clearing CMOS is to reset a system-wide password, we can’t forget about that one.

If you’d to make changes to a PC that has a system-wide password, the easiest way to get rid of it is to clear its CMOS. You should be good to go in a matter of minutes.

Conclusion

Here’s how you can clear CMOS:

Removing the CMOS battery is still the most common way of clearing CMOS / resetting BIOS
CMOS chips don’t store BIOS data anymore. These are typically stored in Southbridge or Super I/O chips
Clearing CMOS can be done in several ways, including removing the battery, using the jumper, or pressing the clear CMOS button
Clearing CMOS can help you with troubleshooting, resetting system-wide passwords, and resetting BIOS defaults after unsuccessful overclocking or hardware upgrades.

FAQ

Does Resetting CMOS Delete BIOS?

Yes, it does.

Clearing or resetting CMOS by removing the battery, using the CMOS jumper, or pushing the clear CMOS button on startup will delete your current BIOS settings and reset them to factory defaults.

How to Clear CMOS?

There are three main methods of clearing CMOS:

Removing the CMOS battery and then plugging it back in after a couple of minutes.
Moving the CMOS jumper to the secondary position, keeping it there for a few minutes then moving it back to the default position. You can use a screwdriver or another metal object too.
Powering on the system then press the clear CMOS / BIOS button located on the motherboard or rear I/O panel.

Should I Clear CMOS Before Updating BIOS?

No, there is no need to clear CMOS before updating the BIOS.

The same goes for clearing CMOS after updating the BIOS, though we’ve seen people do it because it’s “good practice”.

Can I Clear CMOS While the PC is On?

No! To clear CMOS, you need to turn your computer off, disconnect it from the power source, and empty the capacitors by trying to power it on a couple of times.

After doing all of the above, you’re free to clear your CMOS by using one of the above-mentioned methods.

Over to You

What are your thoughts on all this?

Have you managed to fix the issues by clearing CMOS or are they still present?

If you’re still having trouble, hit us up in the comments below or our forum with whatever issues you have that could be fixed by tampering around with CMOS/BIOS.

CGDirector is Reader-supported. When you buy through our links, we may earn an affiliate commission.

How to Reset Your CMOS and Why You Might Need To

Though rare, you may sometimes need to reset your CMOS. The CMOS, also known as the Complementary Metal-Oxide-Semiconductor, is a small chunk of memory used to store your computer’s BIOS or UEFI configuration. This configuration controls what your computer does on boot.

If you’ve mangled your BIOS with a failed overclocking setup, changed the wrong BIOS settings, or your machine won’t boot properly, returning the BIOS or UEFI to the factory defaults can often set things right. Occasionally, even a virus can corrupt your BIOS. You will lose any custom BIOS configurations during a reset, but those can typically be easily reset. If you have an especially complicated setup, you can often back up your working UEFI settings and restore later. You might not have one now, but it’s a good procedure for the future.

If you’ve built your own computer, it should be easy to reset your CMOS. Pre-built systems might be a little more picky, but you can normally make one of the methods below work for you.

Note: for the sake of brevity and recognition, we will use the term “BIOS” below to refer to UEFI and BIOS firmware.

Resetting Your CMOS with a Case Button

If you see a button on your computer’s case labelled “Clear” or “Reset,” that will reset your CMOS. This is the easiest method, but not applicable to all computers.

1. Turn off your computer.

2. Disconnect your computer from the wall outlet. You can unplug the power from the back of your power supply or from the wall outlet.

3. Locate the case button labelled “Clear” or “Reset.” It’s typically next to or near the power button.

4. Hold the “Clear” or “Reset” button down for five to ten seconds, then release it. You may need to use the end of a pen to hold down the button if it’s small.

5. Reconnect your computer to power and reboot.

6. Press the correct key to enter your BIOS options. Depending on your motherboard, it can be the ., Delete, F2, F8 or F12. Different computer makers use different keys, or you can set Windows 10 to boot into your BIOS for you.

7. Adjust your BIOS options as necessary. Some motherboards have the option to load “optimized defaults,” which are a great starting point.

Resetting Your CMOS with a Motherboard Button

Some higher-end motherboards have a board-mounted button to reset the CMOS. This can be accessed by opening the computer case and locating the button within the case. It will typically be labelled something like “CLR,” “CLEAR” or “RESET. ”

1. Turn off your computer.

2. Disconnect your computer from the wall outlet. You can unplug the power from the back of your power supply or from the wall outlet.

3. Press the case’s power button multiple times to discharge any motherboard capacitors.

4. Locate the correct button on your motherboard. If you’re not sure where to find it, look at your motherboard’s manual. You can find these on your motherboard manufacturer’s or computer manufacturer’s website.

5. Press and hold the button for five to ten seconds with your finger or the eraser end of a pencil. If you use your finger, make sure to ground yourself by tapping a bare metal surface (doorknobs are great) before touching anything inside your computer.

6. Reconnect your computer to power and reboot.

7. Press the correct key to enter your BIOS options.

8. Adjust your BIOS options as necessary.

Reset Your CMOS by Reseating the CMOS Battery

If you have no other way to reset your CMOS, you can erase saved settings by removing the CMOS battery. This battery allows the volatile CMOS memory to stay powered even when the computer is disconnected from an outlet. By removing and replacing the battery, you’ll erase the CMOS, forcing a reset.

1. Turn off your computer.

2. Disconnect your computer from the wall outlet.

3. Press the power button multiple times to clear any capacitors.

4. Find the CMOS battery on your motherboard. This is most commonly a CR2032 battery, a coin-sized battery as shown below. You’ll find it near the PCI Express slots on most motherboards. Consult your motherboard’s manual for its exact location.

5. Gently remove the CMOS battery. If it is secured by a metal clip, slide the battery out from under the clip. Take care not to bend the clip.

6. Wait a few minutes, then replace the CMOS battery.

7. Reboot your computer.

Reset Your CMOS with the Motherboard Jumper

By manually adjusting the right jumper, you can trigger the CMOS clearing function.

1. Turn off your computer.

2. Disconnect your computer from the wall outlet.

3. Press the power button multiple times to clear any capacitors.

4. Open your computer case and locate the CMOS clearing pins. It will typically be a two- or three-pin configuration mounted on the motherboard labelled “CLEAR,” “RESET,” or even “CLRPWD” for “clear password.”

Image credit: Toniperis (Own work)

5. On a three-pin configuration with a shared middle pin, move the plastic jumper over to connect the middle pin and the previously disconnected pin. For a two-pin configuration, remove the jumper completely.

6. Wait a few minutes, then return the jumper to its original configuration.

7. Reboot your computer.

You will be able to reset your CMOS using any of the above methods. Let us know if it is working for you. Once everything’s working, take the time to optimize your BIOS settings.

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How to Clear CMOS on an ASUS Motherboard | Small Business

If your business or home computer refuses to start up, especially after changing any of the basic boot settings or updating firmware, you may need to reset settings in the basic input-output system or BIOS. Sometimes, you can do this using the menu prompt when the computer starts up, but if even this isn’t accessible, you may need to reset a small section of memory known as the CMOS. You can reset the CMOS on an ASUS motherboard by wiring together particular pins on the motherboard.

Understanding BIOS and CMOS

Most modern computers have what’s called a basic input-output system, or BIOS, that loads even before operating systems such as macOS, Linux or Windows. The BIOS helps the computer’s central processing unit communicate with memory, hard drives and other installed devices and keeps track of basic data like the system time and boot settings.

It stores that data in a small area of memory commonly called the CMOS, for complementary metal oxide semiconductor, a technology often used to build that area of memory. It’s sometimes also called the RTC, for real-time clock, since it also stores data about what time it is, even when the computer is off. Generically, it can also be called NVRAM, for non-volatile random access memory, referring to the fact that it isn’t changed by rebooting the system. On a Mac, it’s sometimes called parameter random access memory, or PRAM.

Dealing With BIOS Issues

If some of your BIOS settings are incorrect, you can often fix them by entering the BIOS setup menu as you boot your computer. This will allow you to change the order in which your computer looks for devices to load an operating system from, which can be helpful if you want to boot from a DVD or a USB stick instead of your hard drive, and update settings related to installed devices and even the date and time.

When your computer is starting up, look for a prompt to press a certain key, such as F2, F8 or Delete, to load a BIOS setup menu. If you don’t see such a prompt, check your system’s documentation. If you don’t understand a setting, ask for help, contact the manufacturer or another expert. Take notes of the changes you make, and don’t make changes at random, since you might have trouble getting your computer to start up again.

Reset CMOS on ASUS Motherboards

If you can’t make the changes you need through the BIOS settings, you can’t access the BIOS menu because it’s locked with a password you don’t know or the BIOS menu won’t load, you may need to reset the CMOS memory. On an ASUS motherboard, this is a technical process that requires you to open your computer. If you’re not comfortable with tools and electronics, you might want to ask for help or take the computer for professional servicing.

Turn off and unplug your computer. Open your computer’s case with a screwdriver, keeping note of what screws go where. Find your computer’s motherboard and look for the CLRTC jumper, a set of two pins on the motherboard. The ASUS motherboard jumper abbreviation CLRTC stands for «clear real-time clock,» since it’s used to clear the RTC or CMOS.

Then, with a screwdriver, wire or other metal conductor, connect the two pins. Make sure the conductor isn’t touching any other components or yourself. Plug the computer in and turn it on. The CMOS should be reset, and you should be able to hold down the appropriate key to enter the BIOS menu and enter new settings.

When you’re done, turn off and unplug the computer. Remove the conductor and put the computer back together. Start it up normally.

Removing the Battery

If the CLRTC jumper doesn’t seem to clear the CMOS, you can try removing the battery, which is usually a round battery similar to a watch battery. Turn off and unplug the computer, open it up and remove the battery. Connect the jumper pins again.

Boot the computer and verify you can enter the BIOS menu, indicating the CMOS is cleared. Then, shut it down, reconnect the battery and seal the case. Boot the computer, use the BIOS menu to set appropriate settings and use the computer normally.

If this process doesn’t help, contact ASUS or your computer’s manufacturer for help.

que es y cómo hacerlo PASO A PASO ??

Como usuario de PC, es muy útil conocer diversas rutinas de mantenimiento para mantener el buen funcionamiento de nuestros equipos. Muchos de nuestros lectores estarán habituados a estas labores, pero hoy queremos hablar sobre una de las menos conocidas entre el público general, y que guarda una gran utilidad. Hablamos del vaciado de memoria CMOS, o Clear CMOS. Os contamos en qué consiste un Clear CMOS y cómo realizarlo.

Índice de contenidos

Antes de comenzar, un par de conceptos

Antes de comenzar, es importante comprender con qué estamos tratando dentro de nuestro equipo, especialmente si se aspira a usar este método en algún momento. En este caso concreto, el vaciado de la CMOS (Clear CMOS) compromete dos elementos de nuestras placa base: la memoria CMOS y la BIOS.

Qué es la memoria CMOS

La memoria CMOS (RAM-CMOS) es un tipo de memoria encargada de almacenar información sobre la configuración de nuestro sistema, concretamente, la que utiliza la BIOS de nuestra placa base durante la secuencia de arranque de nuestros equipos.

El uso del término RAM para su definición no es arbitrario, se trata de una memoria volátil que perdería la información de su interior si nuestro equipo se queda sin corriente, para evitarlo, se utiliza algún tipo de batería (generalmente una pila de botón) para alimentarla.

Actualmente, muchas placas utilizan memorias EEPROM para este cometido. Estas son no volátiles y cumplen adecuadamente la función de las antiguas memorias CMOS, pero por cohesión en el texto seguiremos hablando de memoria CMOS.

Qué es la BIOS de nuestro sistema

El segundo gran protagonista de este texto es la BIOS. Su nombre proviene de Basic Input-Output System y es el software básico de nuestra placa base. Se encuentra en un chip dedicado dentro de nuestra placa y se encarga de las funciones básicas de configuración y arranque de nuestros equipos. A través de sus opciones podemos modificar ciertos parámetros del comportamiento del hardware conectado a la placa base.

Chip BIOS. Imagen: Flickr, Uwe Hermann

Las implicaciones del vaciado de la CMOS (Clear CMOS)

El Clear CMOS consiste en el vaciado de la información mantenida en la memoria CMOS para forzar un reinicio de la configuración de la BIOS de nuestro sistema, devolviéndola así a sus valores de fábrica.

El por qué del uso de esta acción depende mucho del malfuncionamiento de nuestro equipo durante el arranque. Si creemos que el hardware del ordenador no sufre de problemas físicos (mal estado, simplemente), o presenta problemas de compatibilidad que antes no existían, el reinicio completo de la BIOS a través del Clear CMOS puede ser una posible solución.

Sin embargo, debemos tener en cuenta las implicaciones de realizar esta acción para con nuestro equipo. Realizar el Clear CMOS dejará nuestra BIOS en su estado de fábrica, por lo que se eliminaran tanto configuraciones actuales, como actualizaciones instaladas.

Por poner un ejemplo concreto, si reiniciamos la BIOS de una placa base X370 no podremos usar en nuestro equipo procesadores Ryzen 2000 o 3000 hasta que volvamos a actualizar la BIOS de nuestra placa base.

Cómo realizar el Clear CMOS en nuestro equipo

Siendo conocedor de toda la información previa, si quieres realizar este reinicio a la memoria de la BIOS de tu ordenador, se suele disponer de tres métodos para llevar a cabo esta tarea, aunque en placas base más modernas puede variar.

Realizar el reinicio desde la BIOS de nuestro sistema

Salvo que no podamos acceder a la ventana de la BIOS de nuestro equipo, esta misma es la vía más rápida y segura de realizar un Clear CMOS. Para acceder a la BIOS debemos, durante el arranque, presionar una tecla concreta de nuestro teclado. Esta suele aparecer en pantalla y siempre se indica en el manual del componente.

Una vez dentro, navegamos a través de las opciones hasta localizar nombres como Load factory default, o Clear BIOS settings. Una vez seleccionados y completados habremos realizado un reinicio de la configuración de la BIOS del sistema. Este método también puede completarse en cualquier placa actual.

Si quieres saber más sobre como acceder a tu BIOS no dudes en echar un vistazo a nuestros artículos.

A través de la conexión física de nuestra placa

Si no nos resulta posible acceder a la BIOS de nuestro sistema, podemos atender a los medios físicos de nuestra placa base para realizar el vaciado de la memoria de la BIOS. Este paso siempre debe realizarse con el equipo desconectado completamente de la corriente, o no se realizará adecuadamente.

En placas base modernas, el paso es sencillo: localizar el interruptor de “Clear CMOS” de la placa y mantenerlo activo unos minutos, fácilmente identificable a través del manual del componente. Sin embargo, si nuestra placa base ya está entrada en años, el proceso varía.

Si nuestra placa no cuenta con dicho interruptor, lo que tendremos que localizar es una serie de pines en la placa (dos normalmente, aunque pueden ser mas en algunos casos concretos) y hacer contacto entre ellos con una pieza metálica durante unos minutos. Los pines en cuestión deberían poder identificarse con algún tipo de etiqueta, generalmente “CLR_CMOS” o “JBAT1”, aunque siempre podremos identificarlos a través del manual.

Retirando la batería

Como hemos mencionado anteriormente, las memorias CMOS son volátiles y se alimentan de una batería para mantener su información intacta. Si retiramos dicha batería y quitamos la corriente que alimenta al equipo, la información dentro de la memoria se borrará con cada encendido hasta que repongamos la batería. Esta batería está asociada con el reloj interno del equipo, y suele tener unos 8 años de vida antes de necesitar reponerse, aunque puede variar.

En las placas base más modernas esta opción no existe, al contar con memorias no volátiles, aunque es una opción que aún puede encontrarse en ciertas gamas actuales y en placas con más de cuatro años.

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CMOS-Reset — How to reset the CMOS? (Reset BIOS settings)

CMOS-Reset instructions for PC-Mainboards and Notebooks

When should i reset the CMOS?

Computer don’t boot or freezes during boot process.
BIOS-Error messages like «CMOS Checksum Error».
Reset lost BIOS-Password (only PC-Mainboards).
After making a BIOS-Update (recommendation by many PC-Mainboard manufacturers).
After inserting a new BIOS-Chip.

There are of course other situations, but the above are by far the most common reasons to make a CMOS reset.

What is CMOS?
On which computers can i reset a BIOS-Password?
CMOS-Reset with Jumper
CMOS-Reset without Jumper
CMOS-Reset did not solved the problem! What can i do?

AT YOUR OWN RISK !

I assume no liability for the accuracy, completeness or topicality of the following instructions. These instructions describe only in general, how to erase the CMOS on PC-Mainboards and Notebooks. It may be completely different for your computer!

What is CMOS?

First of all: the CMOS is not the BIOS!
The CMOS (Complementary Metal-Oxide Semiconductor) is a static Random Access Memory (SRAM), which stores the BIOS values. The CMOS will lost its data when removing the voltage/battery (CMOS-Battery, see picture). The duration for a complete loss of data could differs between some seconds, hours, or several days. So it usually won’t help to remove the CMOS-Battery for a short time! For this reason, most of all PC-Mainboards have a jumper to immediately reset the CMOS. Notebooks don’t have any jumper.

On which computers can i reset a BIOS-Password?

YES, on PC-Mainboards you can clear the BIOS-Boot password resp. BIOS-Setup password by resetting the CMOS.

NO, on Notebooks you can not clear the BIOS-Boot password resp. BIOS-Setup password by resetting the CMOS, because most of all (99%) notebooks have a better theft protection. They have an additional small, hidden IC which stores the password. That means: the password is not stored inside the CMOS! But you can also try to reset the CMOS. Other notebooks are able to store the password on a hidden hard disk sector. Your only chance is to contact the support of your notebook manufacturer. Depending on the manufacturer, you have to send him the serial number of the notebook and you’ll get (in many cases free of charge) an individual master password to unlock the notebook. Some other manufacturers even offer only the replacement of the notebook’s mainboard — which will be really expensive!

CMOS-Reset with Jumper

Most mainboard manufacturers have a download section on their websites where you can find the manual of your specific mainboard type. Inside the manual there should be a layout drawing which shows the jumper position.

Read the manual to find out how you can reset the CMOS! Because the procedure can be very different! For instance, most mainboards have to be completely dead, but there are others where you have to reset the CMOS when power is on.

In most cases you can find the jumper (green jumper cap, see picture) nearby the CMOS-Battery. There should be a label like JBAT1, RTCLR, CLRCMOS, CLRCMS, CMOS_CLEAR, Clear RTC, or similar.

There are 4 different CMOS-Jumper types:

3-Pin CMOS-Jumper: The connector strip has 3 pins and the default jumper position is pins 1+2 (see picture). To reset the CMOS move the jumper cap to position pins 2+3.

2-Pin CMOS-Jumper: Depending on the default position, you have to remove or place the jumper.

Soldered points: Sometimes there is no connector strip and you’ll only find 2 soldered points which must be bridged (e.g. with a paper clip) to reset the CMOS.

CMOS-Reset-Button: On newer mainboards you’ll find different buttons for e.g. Power, Reset and CMOS-Reset. The CMOS-Reset-Button works like a normal CMOS-Reset-Jumper.

Instruction: CMOS-Reset with Jumper

Turn OFF the computer and unplug the power cord (on notebooks remove all accus).
Press the Power On/Off button (PC-Case) 3-5 times to discharge the mainboard condensers.
Remove the coin cell battery (CMOS battery).
Move the CMOS-Jumper to his clear-position (read your mainboard manual to find the jumper).
Wait ~ 15 seconds (the longer the better).
Move the CMOS-Jumper to his default position.
Insert the coin cell battery (CMOS battery).
Plug the power cord (on notebooks insert all accus).
Turn ON the computer, enter the BIOS-Setup and load the «Setup Defaults/Optimized Settings».
Save the BIOS settings and restart the computer.
No success? Repeat the steps 1-10.

Never turn on the mainboard during a CMOS-Reset!

It could cause a short circuit which would damage your mainboard!

CMOS-Reset without Jumper

If your mainboard has no jumper (like most of all notebooks) to reset the CMOS, you can try to remove the CMOS-Battery for a few days and hope that this will clear the CMOS. If you don’t like to wait, you can try the following instructions, but as I said at your own risk.

Instruction: CMOS-Reset without Jumper

Turn OFF the computer and unplug the power cord (on notebooks remove all accus).
Press the Power On/Off button (PC-Case) 3-5 times to discharge the mainboard condensers.
Remove the coin cell battery (CMOS battery).
Insert a 10 Euro Cent coin into the CMOS battery socket (or bridge the +/- contacts with a paper clip).
Wait ~ 15 seconds (the longer the better).
Remove the 10 Euro Cent coin (or the paper clip).
Insert the coin cell battery (CMOS battery).
Plug the power cord (on notebooks insert all accus).
Turn ON the computer, enter the BIOS-Setup and load the «Setup Defaults/Optimized Settings».
Save the BIOS settings and restart the computer.
No success? Repeat the steps 1-10.

Never turn on the mainboard during a CMOS-Reset!

It could cause a short circuit which would damage your mainboard!

CMOS-Reset did not solved the problem! What can i do?

First you should try the following:

Repeat the CMOS-Reset and increase the time to clear the CMOS from 15 seconds to a few minutes!
Check the voltage of your CMOS-Battery (~3V).
Remove all unnecessary additional hardware like e.g. TV-, Sound-, and Controller cards on your PC-Mainboard (not on Notebooks!). You only need CPU, RAM and Graphic adapter!
If you have more than 1 RAM module, remove the other (maybe one module is defective?).
Reset the Hardware table (DMI):
the DMI (Desktop Management Interface) manages the integration of various hardware in a computer. Sometimes the DMI data table gets corrupted and you could try to reset it.
Remove the following hardware components:
- RAM
- Graphic adapter (on Desktop-PCs!)
- all drives like Harddisk, CD, DVD, Floppy, (on Notebooks remove only the Harddisk!)
- TV-, Sound-, and Controller cards, etc. (on Desktop-PCs!)
Power on the computer for ~ 30-60 seconds.
Power off the computer, insert all hardware components and restart the computer.
Note: if a working BIOS recognizes that some components are missed, the BIOS automatically scans for new hardware and refreshes the DMI hardware table.

Nothing works?

Check all cable connections.
Check all components and remove any existing dirt.
Replace CPU, Graphic adapter and the Power Supply Unit. Or use a second PC to check these components.
Check all Electrolytic Condensers.
An electrolytic condenser is a cylindrical electronic component that stores electricity.

The cylinder is mostly green, blue or black, and has a pressed aluminum cover.
On older mainboards, it often happened, that the condensers get faulty. In most cases you can identify a defective condenser, when fluid leaked out of the cover, or when the cylinder itself is arched.

User-Comments: CMOS-Reset

Einträge: 46

biosflash 14.Sep.2022 18:11

@francois
Please read: https://www.biosflash.com/e/bios-cmos-reset.htm#Password (the admin password is also stored in the same way as the bios password)

francois 14. Sep.2022 14:55

WOULD THIS REMOVE A BIOS ADMIN PASSWORD TOO

franca 12.Nov.2021 13:18

pc ASUS all’avvio schermata nera e 3 beep, cosa fare? Grazie a chi mi risponde.

Homayoun Nobarani 17.Mar.2020 14:50

Thank you very much for creating this wonderful page with real information. Thank you!

MelanieWeber 12.Jan.2020 12:14

Hi
Great resource, thank you.
I have bought lenovo x201 with bios settings supervisor password protected.
Not too good with electronics, so will probably not go beyond the battery and 10 cent trick.

Quick question I haven’t found addressed. If I just accept the inability to use Bluetooth or change the booting order, what will happen when the CMOS battery eventually dies and I replace it?
Would you expect any problems making the laptop unable to start? The bios clock is now set to 2010, but this is not causing any problems to windows 7.

Thank you

some dude 28.Oct.2019 15:22

Thank you for creating this wonderful page with all this information. Thank you!

George 17.Apr.2019 15:29

Similar boot prob, but with no video. Did procedure above: now power on button press does nothing. ??? What now?

TomW 5.Nov.2018 21:45

Hello: Still not working. I left the M/B completely unplugged, no power, no battery, no hard drives, no cards, and the CLR_CMOS pins shorted for a day. Pressed the main PC on/off button several times, etc. Only using M/B, power supply, 1 RAM card in first slot, 1 CPU, built-in graphics, PS2 keyboard, no mouse, no usb, no controller cards, no sound cards, no usb3, as plain as it can be. When I switch on the PC, it tries to boot, then turns itself off for a few seconds, then turns itself on again and boots to the screen asking me for a password. This PC was working fine, I went into the setup a few days ago to check the user and admin passwords, but noticed the one was what it should be, but the other, which should have been the same word, just would not accept, giving wrong password error for the old password to be typed in etc. I thought that was strange as both PW’s should be the same word etc. I guess the CMOS chip must be faulty, which is why it won’t reset ??. Thanks TomW.

biosflash 4.Nov.2018 22:18

@TomW
Try this

Please note: while testing, you should remove all unnecessary additional hardware components from your PC (not on Laptops)! You only need: 1 CPU, 1 RAM 1 Graphic adapter, Power supply unit + mainboard. No CD- and HDD drives! No USB-Sticks! No TV-, Sound-, and other Controller cards, etc.! Connect USB Mouse and USB Keyboard only on USB2.0 ports! Don’t use USB3.0!

If all this do not work, then the motherboard or bios chip itself could be defective or some other connected hardware components prevents the PC to boot up.

TomW 4.Nov.2018 20:37

Hello: I have a FOXCONN H61MXE motherboard. Everything has been working fine. Recently, I tried to clear the CMOS passwords since the ‘User’ password would not change whilst in the setup, must be an old PW I have forgotten what it is. Following the simple manual instructions to short out the 2 CLR_CMOS pins on the M/B, even removing the battery, and left short out overnight, the CMOS just will not clear. I have also removed all hard drives etc. I have also shorted out the M/B battery pins whilst the CMOS pins are shorted, and also pressed the PC’s main on/off button on and off at this time too. Nothing works. What do I do ?. Thanks….

Richard Gross 25.Jul.2018 18:31

I have a DELL XPS one 2710 AIO. While flashing / upgrading the BIOS the electric power went out. Now the PC has power and attempts to start. After approx. 4 seconds (no display on screen) it tries to restart and continues this loop. On the initial try the power button light displays normally. Of the three diagnostic lights on the front of the PC…..the 2nd light illuminates on the first power-up, but not after subsequent power=ups. CMOS resets have not been successful. Any advise would be greatly appreciated. Thanks in advance!!!

Tobie 30.Jul.2017 12:03

Thanks it works!!

biosflash 26.May.2017 05:58

@Johnnie
You can edit time + date inside the bios setup.

Johnnie 26.May.2017 01:33

I try to format laptop (hp Compaq NW8240) and it was showing me 163- date and time not set, so i remove the CMOS battery and replace without another one but it was still showing me the Same thing, please what can i do to solve that?

Ted 28.Oct.2016 14:59

Thanks man, the 10 cent trick worked for me and could reset the BIOS and restart my laptop 🙂

vishnu 2. Oct.2016 19:03

thanks for the clear instructions. it worked for me

biosflash 8.May.2016 10:43

@Zidan
That’s hard to say. Maybe your southbridge (https://de.wikipedia.org/wiki/Datei:Motherboard_diagram.svg) is defective, because it contains also the CMOS MEMORY to store date & time. You should better ask the Acer support.

Zidan 8.May.2016 09:16

Hello. After browsing the web I have decided that this site is the most knowledgeable in these matters. I have an unusual problem with an Acer Asprire 4572 that I bought second hand a year ago. I have been working with laptops for the past 20 years so I am fairly conversant with their inner parts. I noticed that this machine loses its time and date each time the main battery is removed or goes completely flat. Naturally I thought that the CMOS battery was dead so today I replaced it. However when I removed the old battery I discovered that it was still giving 3V. I made sure that the terminals and contact surfaces were thoroughly cleaned before I fitted the new battery. However upon rebooting and resetting the Bios (I am running the machine in IDE mode not SATA mode) I discovered that after removing the main battery as a test the clock an the BIOS settings reverted to their defaults again. It therefore appears that the CMOS is not drawing any power from the on-board battery, instead it is using the main battery. Any suggestions as to what is happening here?

ishan 19.Nov.2015 07:01

i had a problem last night when i was upgrading my msi990fxa-gd65 board using gui upgrade process after that my system hanged and i restart using button on my rig then it’s generate a cycle reboot process everyime and i didn’t get anything on display and tried everything what u post and it’s not worked for me plz help me sir…

padayappa 13.May.2015 09:23

very very useful infomation thanks very much

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How to reset the BIOS and revive the computer

April 13, 2018LikbezWindows

If the computer turns off for no apparent reason, does not turn on, or you forgot the BIOS password, try resetting the settings.

Reset can also be useful when Windows won’t start or your computer is unstable. If you’re experiencing these issues after changing your BIOS settings or after a firmware crash, then these instructions may help you.

Recall that the BIOS is a software environment that controls the basic functions of a computer and is the link between the hardware and the operating system. After the reset, the files on the drives and Windows settings will remain intact. But, most likely, you will have to go into the BIOS, find the section with the time and date settings and reconfigure them.

All of the listed reset methods work for both desktop and laptop computers.

1. How to reset the BIOS through the software interface

The easiest way to reset the BIOS is to open its interface and use the reset command. But this option is only suitable if the computer turns on and you remember the BIOS password or did not set it.

lumpics.ru

To get to the interface, in the first seconds of turning on the computer, press F1, F2, F8, Delete or another key until you see a menu with settings. As a rule, the desired button is displayed at the bottom of the screen when the device starts.

Once in the BIOS menu, find an item with a name like Reset to Default, Factory Default, Setup Defaults or Load Optimized Defaults. This option is usually found in the Exit section. Use it and confirm the action — the computer will restart and the settings will be reset.

If for some reason you cannot get into the BIOS interface or find the desired item, try the following methods. But to do this, you will need to remove the case cover to gain access to the motherboard.

Please note that opening the case may void the warranty.

2. How to reset the BIOS using the jumper or button on the board

Turn off the computer and unplug it from the power outlet and other devices. If you have a laptop, remove the battery. Then remove the case cover and inspect the motherboard.

Some new boards have a dedicated BIOS reset button. Usually, right on it or next to it, you can see inscriptions like CLEAR, CLR, PSSWRD or CLR_CMOS. If you find such a button on your motherboard, just press it. The BIOS settings will be reset, and you will only have to assemble and turn on the computer.

www.pcgameware.co.uk

If there is no such button, then next to the battery there should be a so-called jumper — a special jumper with which you can reset. It occupies two contacts out of three. Remove it and put it on the other two contacts.

Example: a jumper (yellow jumper in hand) connected the first and second pins. Remove it and temporarily put it on the second and third

While the jumper is in a new position, press the computer’s power button and hold it for 10–15 seconds. The computer will not turn on because it is not powered, but the BIOS settings will be reset. After that, you can return the jumper to its old place, and then assemble and turn on the computer.

If this method doesn’t work or you can’t find the jumper, try the next one.

3. How to reset the BIOS using a removable battery

BIOS settings are saved even when the computer is not connected to power sources. This is due to the battery on the motherboard, which constantly feeds the microcircuit. But if you remove it for a few minutes, the BIOS will reset.

Turn off the computer and unplug it from the power outlet and other devices. If you have a laptop, remove the battery.

Remove the case cover and locate the battery on the motherboard. Then carefully remove the battery for 10 minutes and reinsert. Do not overdo it: in some devices, it may not be removable. In such cases, it remains to rely only on the previous methods or give the device for reset to a service center.

On many laptops, the battery is connected to the motherboard with a special cable. If you notice this, disconnect the wire from the board before removing the battery.

After reinstalling it, close the case, replace the battery if necessary, and turn on the computer.

Wake-On-Lan

We often get questions on the forum. They are responded to as quickly as possible. And sometimes, the number of questions that are identical in content begins to skyrocket. And this phenomenon has not bypassed the Wake-On-Lan technology, which has been implemented on a mass of motherboards manufactured by GIGABYTE.

Today’s example with pictures will attempt to bring some clarity to the setup and operation of WOL. What is Wake-On-Lan and why is it needed can be found on the all-knowing Wikipedia site:

http://ru.wikipedia.org/wiki/Wake-on-LAN

Let’s start with the configuration. The following hardware was used:

GIGABYTE GA-Z77X-D3H motherboard

Intel Core i5 -2300

Intel BOX Cooler

Kingston KHX11000D3LL/2G RAM connected to DDR3_1 slot

Drive wd1002faex

CFT-1000G-DF power supply

Operating system Windows 7 Professional x64

into the local network. However, for guaranteed correct settings in the UEFI environment, it is still necessary to bring it to uniformity and harmony. To do this, you need to clear the CMOS. This is done by shorting the two CLR_CMOS pins with a metal jumper WITH A COMPLETELY DEFECTED SYSTEM . But we used the proven, old-fashioned method, and closed the contacts with a screwdriver☺

Detailed information on the CMOS reset procedure is given in the official motherboard manual.

After, the system turns on, and subsequently a message is displayed on the screen that the BIOS has been rebooted, and you are prompted to select the desired option. The third one is selected — entering the BIOS settings menu.

After resetting the CMOS, all parameters are reset to the factory settings and, therefore, the possibility that some settings have affected the WOL functions necessary for correct operation is excluded.

In a UEFI environment, you need to switch to Advanced mode (where there are no beautiful views of the board). This is done by pressing the F1 key. Next, you need to go to the Power Management menu, and make sure that the ErP parameter (it is responsible for the WOL functionality) is set to Disabled. If not installed, it must be installed.

Next, you can save the settings and exit by pressing the F10 key. The operating system is loading…

So, in the operating system environment, it is necessary to prepare the Ethernet adapter to “listen” to the air in order to receive a “magic packet”. This package is just designed to transfer the computer from S5 mode to S0 mode at the right time, without the user’s physical participation. To do this, you must perform the following adapter settings. Let’s go to the computer management menu by right-clicking on the «Computer» icon on the desktop, and selecting the «management» item:

Next, go to device manager→network adapters→right click on the Atheros device→properties.

Go to the «advanced» tab. There we select the parameter «WOL Magic Package». It must be enabled. If it’s off, turn it on.

Next, go to the power management tab, and set the checkboxes as shown in the figure:

In fact, after that the computer is already ready to wake up on the “Magic packet’a” command And all that remains to be done is to learn how to “wake it up «. But before that, you need to find out what physical and IP address the computer currently has. You can do it like this:

Go to the network and sharing center (either using the device manager or via the tray icon), select the current LAN connection and click the «details» button there. After, you can see extensive information regarding the network connection. We are interested in the «Physical Address» (aka MAC) and IPv4 Address columns. We write them down on paper. In our case, these are, respectively, 50E549EDFCA3 and 192.168.100.55.

After, we turn off the computer in an exclusively correct way, through the “shutdown”. This is necessary so that the network adapter continues to function correctly and receive «magic packets» after the computer is turned off.

After the computer shuts down, you can make sure that the network adapter continues to work by cherishing winking LED:

Please note that further blackout is absolutely unacceptable. If you unplug the power cable or turn off the “pilot” surge protector, the computer will not be able to turn on remotely.

So, now you can proceed directly to the procedure for remotely turning on the computer. This is done using special software that can generate and send a “Magic packet” to the desired address. There is a huge amount of such software available, and everyone can find something personally to their liking. We settled on the free utility WOL 2. 0.3. It is installed on a third-party computer, from which, in fact, the computer that is waiting for “Magic Packet” will be switched on remotely.

Installation takes place in the most elementary way:

After the program starts, and it is necessary to make settings for adding a computer that will be turned on remotely. To do this, in the main window, click the “add new item” icon, in the window that appears, enter the IP and MAC addresses previously recorded on a piece of paper. Next, press the OK button.

After that, in the rows of the list of the main window, an entry about the computer with the parameters entered earlier should appear. Highlight the entry below the «Host» column, the interaction icons become active, and click on the one called «Wake-up». After this action, the coveted “Magic packet” will be sent to the remote computer, and the computer will react as if the Power button was pressed, or, in other words, it will turn on.

Here is a summary of how to remotely power on a computer based on a GIGABYTE motherboard using Wake-On-Lan technology. But what to do next with the computer, how to connect, how to work and how to turn it off is up to you, because that’s a completely different story☺

All intellectual property rights, including copyrights and trademarks, are reserved;
any use without prior written permission from GIGA-BYTE TECHNOLOGY CO., LTD is strictly prohibited.

Clear cmos jumper where it is located. Power and reset CMOS memory. What is Flash ROM

Hello dear friends! Users, having set a password on Bios, often forget it. Only here it is impossible to enter the system without typing the password. I decided to write about how the BIOS password is reset in this article.

This is what the monitor looks like when prompted for a password:

Clear CMOS

Turn off the computer, unplug the power cable from the computer. Now find the Clear CMOS jumper on the motherboard (the Clear CMOS inscription is usually located near the battery, the inscription can also be abbreviated). Now move the jumper to the next place. After it has been moved, click on the «Power» button (turn on the computer). Now put the jumper back and you can turn on the computer.

Motherboard manufacturers have long since straightened out their strengths and gone are the days when some company motherboards showed superior superiority over others even though they were based on the same schematic set. At present, the performance differences of various brands and models are within the statistical error of the tests carried out and are of little significance. Therefore, only comparisons between different chipset models are interesting.

What are POST-Codes?

This is the reason motherboard manufacturers focus on other things to differentiate their products. Ecology and the so-called «green» movement did not pass through this industry. All manufacturers are paying close attention to this, and as a result, we see more and more new technologies being introduced on motherboards to save energy. In the end, the choice of motherboard is limited by its functionality, cost and technical support. Taking into account the fact that the differences in performance tests between different models and models of motherboards based on the same chipset are insignificant, we decided to compare only different chipsets.

After these steps, the password and default settings (Default) will be reset.

If you can’t find where exactly Clear CMOS is located, read the instructions for your motherboard, which are given when buying a computer. In case of its absence (lost, thrown away), enter your motherboard model into the search engine and find the place where Clear CMOS is located.

For this reason, we only compared a few motherboard models that came in for editing tests. We used mainly gaming applications to measure performance. But here we will not go into details, because there is a lot of information on this subject on specialized forums. Here is a place where you can clarify the situation. It is for this reason that some manufacturers have added another bridge, thus providing the functionality of the top model at a much lower price.

Some companies, of course, produce products with their own designs. It does not use thermal cooling of the components, but is classic with conventional aluminum heatsinks that do the same in general because they are quite massive. In addition, the board is all-solid electrolytic capacitors and 8-phase CPU power. Despite the simplified design, the overclocking capabilities of the board are not degraded and are in no way inferior to the overclocking capabilities of its larger counterparts.

Read below to learn how to reset the BIOS password using the battery on the motherboard.

Motherboard battery

BIOS password reset
. To do this, turn off the computer, pull out the power cable and on the motherboard, pull out the battery (where it is, see the figure above).

8-phase processor power with improved output voltage filtering. This guarantees good overclocking stability even on older quad-core processors. There are two buttons on the board, which have become an integral part of the enthusiastic solutions and make them much easier to manipulate when using the stand. Overall, the board performed well in our tests and we didn’t have any issues with it.

Do I need to change the battery?

Actually, the design of the board is different from the one described above. Cooling has also been simplified. We were very surprised, since the smaller model did not have such problems. We hope that things will change in a positive direction with the release of the new firmware update. The board design is very precise and the placement of each component is well thought out. Cooling is based on heat transfer technology, and an additional fan is added to the kit, which is especially useful when overclocking. There are several LEDs on the PCB that show the status of the individual subsystems.

Use a small screwdriver to remove the battery. Just press the latch, which is located in the battery slot, and it will rise up by itself. Remove the battery, press the «Power» button (the power cable should not be connected while pressing) and leave the computer in this state for 30 — 180 minutes.

These actions will reset the password and restore the default settings
(Default). When the time has passed, you can put the battery back in and turn on the computer. After that, when the computer boots up, the message “CMOS checksum error – Defaults loaded. Press «F1»: to continue, «DEL»: BIOS Setup» or «CMOS checksum Failure».

There is also an extended set of parameters and monitoring options, as well as an external indicator of what is happening during the procedure after the procedure. The board was very stable and showed excellent overclocking capabilities. The only downside is its higher price.

Cooling is realized by means of heat transfer technology, and the southbridge is cooled independently by a classic aluminum radiator. The kit includes an additional heatsink with a blade that is mounted on another one, which improves cooling, which is especially necessary when overclocking. In tests, the motherboard performed well. It has become fashionable for companies to create special editions designed for enthusiasts. The components are optimally positioned and the slots have different colors. Cooling is classic, and separate aluminum radiators are used for the north and south bridges of the chipset.

The inscription may be different, but the meaning will remain the same .
In the figure below, you can see an example of such a message:

If you want to boot the computer with the default settings (Defaults), then press the «F1» key. More advanced users can enter the BIOS Setup by pressing the «Delete» key, where you can configure the BIOS. After setting, press «F10» and confirm the changes made with the «Enter» key.

This is not a problem at factory frequencies, but when overclocking requires replacement with a more adequate one. The power is four-phase, and this makes the motherboard not particularly suitable for more extreme overclocking of 65nm quad-core processors. The board performed well in tests, but when overclocked it didn’t show a particularly satisfactory result. The motherboard has a high contour. It was also equipped with the best cooling of all the tested offerings. Superior hybrid cooling is used, where overclocking components are cooled further by both water and conventional airflow methods.

Read along with this article: « »

Good luck! Try not to forget BIOS passwords!

Section still in progress…

Basics

What is a CPU?

CPU (from the English «Central Processing Unit») — the central processing unit — the central processing unit, the main part of the architecture of a personal computer. Designed for general purpose calculations (performs logical and arithmetic operations), I / O operations, as well as for controlling all other computer components. Physically implemented, as a rule, in the form of a discrete microcircuit. This microcircuit is either installed in a special connector on the motherboard (socket), or soldered directly on it.

Motherboard form factor

Motherboard form factor (from the English «Form Factor») — form factor — an industry standard that determines the overall dimensions of the motherboard, the number and location of its attachment points to the case, the location of various devices and connectors on it (central processor socket, slots for RAM, bus interfaces, I/O ports, etc.), as well as the location and type of connector (or connectors) for connecting the power supply to it.

With regard to conventional (office or home) computers, the main modern motherboard form factors are: ATX, Micro ATX, Flex ATX and Mini-ITX.

This ensures that all components are cool enough under all conditions to satisfy even the most demanding customers. The menus and settings are quite detailed and intuitive. The card was great in tests and showed great overclocking capabilities. The goal was to reduce the cost without affecting its other qualities. The bottom is well balanced as price and opportunity. Cooling is classic with conventional aluminum heatsinks that are sufficient to run at factory frequencies or even slightly overflow.

Major modern motherboard form factors (inches)

The retail market is dominated by ATX, Micro ATX, and Mini-ITX boards.

Rare, but there are other variants. So, AMD, specifically for small-sized home computers, proposed the DTX / Mini-DTX form factor, which, unfortunately, has not received mass distribution. And EVGA has released several HPTX form factor boards aimed at wealthy enthusiast maniacs.

But if you plan to use it for more serious overclocking, you will need to replace it with a more suitable one for this purpose. This, however, can hardly be considered a disadvantage. In tests, the motherboard worked well, without any anomalies in its behavior. This motherboard immediately picks up its black color and oddly shaped coolant. The board design is very well thought out and every component is in the best position possible. This is only an approximation, of course, as it only takes into account the motherboard, processor, memory, and expansion board, but cannot read the consumption of other expansion cards or more powerful video accelerators that require additional external power.

E-ATX (Extended ATX) professional form-factor boards are almost never found on the non-professional computer market, but sometimes compatibility with them is indicated by computer case manufacturers.

The table below shows the characteristics of modern motherboard form factors in descending order of their overall dimensions.

The motherboard has a distinctive black color and is colored in different slots. In fact, the chipset and this additional bridge are not the coolest, and even with light overclocking they bake a lot, so the board must be pulled in by an additional fan. In tests, the motherboard was excellent and showed some of the best overclocking capabilities. The board is equipped with a massive cooling system, and a fan is added to it. The chipset is quite hot, so even if you don’t expect more stable overclocking, it’s a good idea to add an extra heatsink in place.

Form factor (standard)	Dimensions, mm		Number of slots for expansion cards
Form factor (standard)	width	height	Number of slots for expansion cards

HPTX	381	345	up to 9
E-ATX	330	305	7

ATX	244	305	7

MicroATX	244	244	four

FlexATX	191	229	3

DTX	244	203	2
Mini-DTX	170	203	2

Mini-ITX	170	170	one

A few notes on the table.

The major modern motherboard form factors are highlighted in bold.

If the computer case is designed for a board of one form factor, then all downstream ones will also fit in it.

It should also be noted that the form factor is advisory in nature, so manufacturers can change the size of motherboards (usually in the direction of reducing the width), while declaring compatibility with the standard.

What is Flash ROM?

The board performed very well in tests and showed excellent overclocking capabilities. Thanks for the courtesy of the companies. We start with design and equipment. To improve cooling, the engineers also provided 4 fan headers. The abbreviation in brackets in the nomenclature indicates that the bottom is made entirely of polymer capacitors. The FETs in the four-channel voltage regulator are passively cooled by a finned heatsink.

Another quirky idea from the designers is to fill in the gaps on the sparsely populated rear panel at the bottom by pairing a modern chipset with maritime memories of peripheral ports such as a pair of serial and parallel ports. CPU voltage regulator 4-channel, without additional cooling of components.

BIOS

What is a BIOS?

BIOS (from the English «Basic Input / Output System») — a basic input / output system — software that provides interaction between the operating system and computer hardware resources.

The physical implementation of the BIOS is the chipset on the motherboard, plus the battery that powers the CMOS.

The BIOS program itself is stored in the Flash ROM chip (for older computers, in EPROM or EEPROM). In modern computers, this microcircuit, as a rule, is removable, and lies in a special «crib».

To «translate» into the actual gaming language, see the results in the big comparison table. The color combination is tough — black and blue, the design is unusual: the processor socket is rotated 90 degrees from the standard orientation, and the memory slots move along it and are parallel to the «north» edge of the board.

General specifications for tested motherboard models. Comparison of processor and memory performance for different chipsets. Comparison of the performance of various chipsets in video applications. In this situation, it is recommended to reduce them by one degree.

What is an EPROM?

EPROM (from the English. «Erasable Programmable Read Only Memory») — read-only memory, erasable, programmable — a permanent (non-volatile) memory chip, the contents of which are erased using an ultraviolet lamp. To write information into such a chip, you need a special device — a programmer.

What is EEPROM?

EEPROM (from the English. «Electrically Eraseble Programmable Read Only Memory») — read-only memory, electrically erasable, programmable — a permanent (non-volatile) memory chip whose contents are erased using an electrical signal. To record, you also need a programmer.

EPROM and EEPROM are obsolete types of microcircuits, and in modern computers they are no longer used to store the BIOS program.

High load alarms. When alarm messages begin to appear when the computer is overloaded, such as when playing or transcoding video, the hardware components overheat. Provide better cooling inside the PC case, improve air circulation and install an additional fan. You can temporarily cool down your computer by opening the lid.

To do this, turn off the computer and unplug the power cord. If these problems are caused by overclocking, do not set such high values next time. Motherboard manufacturers use different codes. Their meaning is given in the instruction manual for the disc.

What is Flash ROM?

Flash ROM (from the English «Flash Read Only Memory») — read-only memory, on «flash» microcircuits — «reflashable» permanent (non-volatile) memory. You can also update information in such a chip using software (usually from DOS).

What is CMOS?

CMOS (from the English «Complementary Metal-Oxide Semiconductor») is a memory for storing information about the current configuration (settings) of the computer hardware. The name comes from the transistor manufacturing technology — the complementary metal-oxide-semiconductor (CMOS) structure. It is for the preservation of this information when the power is turned off that the same battery is used.

What is a CMOS Battery?

CMOS Battery (from the English «CMOS Battery») — a CMOS battery is a power source necessary to store information in CMOS when the computer is powered off.

Some mistakenly think that there is a battery on the board — no, there is a regular 3 V lithium battery. Why does it last so long? Because the current required to power the CMOS chip is very small, and the battery itself is of very high quality 🙂

Hardware damage. If your computer is not working despite the above resuscitation attempts, you are most likely dealing with hardware damage. Motherboard errors are rare. Most subnets that have been overclocked are eligible to participate. To get them, type diagnostics in the Start search box and click on the found entry.

This can help when alarms are displayed on a blue background and when the system freezes frequently. This should also be done if components such as working memory or hard drive are unstable or too slow. However, on the other hand, this operation is associated with a certain risk.

Do I need to change the battery?

If the computer is already old (well, older than eight years, for example), then the battery may be discharged. The first sign that this is approaching is the lag of the system clock. This is not good, because if the battery is completely discharged, the CMOS data will be erased, and the computer will either turn on with CMOS settings reset to default values, or not turn on at all. Therefore, it is better to change the battery. Any lithium power supply type CR2030 or CR2032 will do (preferably this one).

Otherwise, the computer may not detect new components or choose the wrong settings for its operation, so that it does not work properly or with poor performance. For example, in laptops, manufacturers tune in newer software versions. fan speed and temperature. Then it turns on less frequently and runs at lower speeds and is even quieter. In addition, the manufacturer may change the default brightness of the screen.

When to stop updating. This should not be done if there are no prerequisites for this. So if your computer is working as expected, it’s best not to update. In fact, these are two completely independent creations. It contained 64 bytes for data storage, of which 10 bytes are reserved for the clock function. While the layout is called non-volatile memory, it’s actually not. Most lithium batteries can last 5 or more years.

Here it should be noted that without a battery, the CMOS data is erased (after a couple of seconds). Therefore, before replacing, it is useful to remember or write down all the settings by going to BIOS Setup. Well, after the replacement, respectively, restore them there.

The process of pulling out and re-installing (after a couple of seconds) the batteries can also be useful if you need to clear the CMOS (and most importantly, erase the BIOS Setup password :), but no other means have been found for this 🙂

For simpler and safe manipulation of CMOS data, it is recommended to use the CMOS De-Animator program — a utility that allows you to erase the CMOS checksum, reset all BIOS settings to default values, and also erase all BIOS passwords (if any). In addition, the program can save the current CMOS settings to a file, as well as restore them from a saved file. You can download this program from here.

What is Clear CMOS?

Clear CMOS (from the English «Clear CMOS») — clearing CMOS — erasing all information stored in CMOS. All settings are reset to some basic values (default values). A jumper (jumper) on the motherboard, located somewhere near the battery, is usually responsible for the implementation of this function. How to use this jumper should be indicated either in the description of the board, or directly on its textolite.

As a rule, to erase CMOS data, you need to move the jumper to the next position, turn on the computer, wait a couple of seconds, turn off the computer and move the jumper back.

What is RTC?

RTC (from the English «Real Time Clock») — real time clock — an electronic circuit designed to record chronometric data (current time, date, day of the week, etc. ). It is a system of an autonomous power source and a metering device.

What is Clear RTC?

Clear RTC (from the English «Clear Real Time Clock») — clearing (resetting) the real time clock. In relation to computers, as a rule, the same as Clear CMOS.

What is POST?

POST (from the English. «Power On Self Test») — self-testing when the power is turned on — checking the functioning of the computer hardware before loading the operating system. It is performed by programs included in the BIOS of the motherboard.

What are POST-Codes?

POST-Codes (from the English «Power On Self Test Codes») — self-test error codes (numeric, in hexadecimal format). The meanings of these digital codes should be given in the BIOS description of the motherboard.

What is BIOS Setup?

BIOS Setup (from the English. «Basic Input / Output System Setup») — a program for setting up the current configuration of the computer. The phrase «enter the BIOS» implies the launch of this particular program 🙂

In general, it is more correct to say not BIOS Setup, but CMOS Setup, since it is not the BIOS program that is configured, but the CMOS data. However, the phrase BIOS Setup is more common.

What is ESCD?

ESCD (from the English. «Extended System Configuration Data») — extended system configuration data — are responsible for configuring Plug & Play devices. If you change the hardware configuration of your computer, for example, when replacing a video or sound card, they must be updated. There is a corresponding item in the BIOS Setup for this.

What is ACPI?

ACPI stands for «Advanced Configuration and Power Interface» — an advanced configuration and power management interface. ACPI has replaced APM (Advanced Power Management), and defines a common interface for hardware discovery, power management, and configuration of the motherboard and other devices. ACPI’s job is to provide communication between the operating system, hardware, and motherboard BIOS.

BIOS Software Manufacturers

BIOS Software Manufacturers:

Award Software
, owned by Phoenix Technologies Ltd. (Award BIOS)
American Megatrends Inc.
(AMI BIOS)
Phoenix Technologies Ltd.
(Phoenix BIOS)

On modern motherboards, as a rule, either the Award BIOS or the AMI BIOS is installed.

You can download all the necessary programs for working with the BIOS from the corresponding section of our file archive.

UEFI

What is EFI?

EFI (from the English. «Extensible Firmware Interface») — an extensible firmware interface (firmware) — software that provides interaction between the operating system and firmware that directly controls the computer hardware. The main purpose of EFI is to correctly initialize existing hardware and transfer control to the operating system loader.

The EFI specification was originally created for the first Intel systems — HP Itanium in the mid 1990s. The EFI 1.02 specification was released by Intel on December 12, 2000.

What is UEFI?

UEFI (from the English «Unified Extensible Firmware Interface») — a unified extensible firmware interface (firmware) — a version of EFI for the Intel x86, Intel x64 and ARM architectures. It is positioned as a replacement for the BIOS in personal computers.

UEFI is currently developed by the Unified EFI Forum. The latest version of UEFI 2.5 was adopted in April 2015.

In fact, EFI / UEFI is some kind of operating system, with its services, drivers, support for drives and file systems (including FAT32) and with its own graphical shell (EFI shell). The shell can be used to execute various EFI applications such as system setup, OS installation, diagnostics, firmware upgrades. EFI shell commands allow you to copy and/or move files and directories on supported file systems, and load and unload drivers. The shell can also be used for, for example, playing a CD/DVD or accessing the Internet (without booting the «main» OS), provided that the EFI applications support these features.

In other words, the EFI shell is a functional replacement for the BIOS text interface and the DOS command line interpreter.

You can download all the necessary programs for working with UEFI from the corresponding section of our file archive.

Material still in progress…

How to make Clear CMOS

01/24/2016
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CMOS is the abbreviation of complementary metal oxide semiconductor, which means electronic circuit technology. Clear CMOS or clearing the CMOS on a computer will reset your BIOS settings to factory defaults, these are the motherboard settings that the manufacturer believes are the most needed for everyday tasks.

One of the reasons why you need to do a CMOS cleaning is to help you troubleshoot or solve certain problems with your computer, in particular, issues related to hardware compatibility, or some kind of malfunction in its operation, for example, you receive message:

please clear cmos

Many times, a simple BIOS reset has helped «resurrect» a computer.

You can use the clear CMOS to reset the BIOS password, for example, or if you have made some BIOS changes that you think caused the computer to malfunction.

Below, we will talk about three different ways to clear CMOS .

Important. After clearing the CMOS , you may need to access the BIOS settings to make changes. In most cases, the default settings in modern motherboards work optimally, however, if you have made changes yourself, for example, you are fond of overclocking (hardware overclocking), you will have to make these changes again after resetting the BIOS to factory settings .

1. Clear CMOS using the «factory defaults» option in BIOS

The easiest way to clear the CMOS is to go into the BIOS setup utility and look for Reset BIOS Settings.

The exact name of this menu item depends on the BIOS of your motherboard, in most cases it will sound like this: reset to default, factory default, clear BIOS, load setup defaults and so on. It seems that every manufacturer has their own way of naming this menu item 🙂

The BIOS Settings item is usually located at the bottom of the screen or at the end of the BIOS settings menu, depending on how it is structured. If you have difficulty finding this item, look for it next to the Save or Save & Exit items, they are usually located nearby.

After you run clear CMOS you need to save the changes and restart your computer.

2. Clear CMOS using battery

Another way to clear CMOS is to remove the battery on the motherboard.

Make sure your computer is turned off before you start. If you have a laptop or tablet, you must also remove the battery.

Next, remove the cover of your system unit if you have a desktop computer, or find a small panel under which the CMOS battery is located if you have a tablet or laptop.

Next, you need to remove the CMOS battery for a few minutes and then put it back in. Close the lid or battery panel, now you can turn on the computer or connect the battery for mobile devices.

By removing the CMOS battery, you disable the power supply that saves your BIOS settings, thereby resetting them to factory settings.

Laptops and tablets . The CMOS battery shown in the picture is in a special case and is connected to the motherboard using a 2-pin white connector. This is the common way mobile device manufacturers connect the CMOS battery. To do clearing CMOS , in this case, you need to pull the white connector out of the motherboard and then plug it back in.

Desktop computers . Finding a CMOS battery in most desktop computers is much easier, it looks like a regular battery that is used in small toys or watches. To reset the CMOS, you need to remove the battery and then put it back in.

3. Clear CMOS via jumper on motherboard

Another way to make clear CMOS is to remove the small jumper that is on your board.

Most desktop motherboards have this jumper CMOS , but most laptops and tablets do not.

Make sure your computer is turned off and then remove the side cover. Look at your motherboard and look for a jumper (as pictured) that says CLEAR CMOS. These jumpers are often located near the BIOS chip or CMOS battery. They may also be called CLRPWD, PASSWORD, and even CLEAR.

Remove the small plastic jumper from the 2 pins located on the motherboard. Turn on the computer and make sure the BIOS settings are reset or that the system password is cleared… if that’s why you did the clearing CMOS.

If all is well, turn off the computer and replace the jumper. If you don’t do this, CMOS will be reset every time you restart or turn off your computer.

P.S. If you have any problems with the equipment, please contact our computer service, or order a visit of a computer wizard.

How to reset the BIOS to factory settings

What is the BIOS

BIOS is translated as (Basic Input Output System) — “basic input / output system”, looks like a chip on the motherboard. A basic list of parameters and system commands is “hardwired” into the microcircuit; when they are changed, the user can choose the most appropriate settings for the computer to work.

On boards from 2012, you can find DUAL BIOS (dual BIOS). If this technology is built into the motherboard, then two bios are soldered on it, the first is the main one, and the second is required for recovery.

Consequences of a BIOS failure

Here are the most common symptoms of a BIOS failure that may require flashing it, but you can often get by with a simple CLR CMOS reset.

The reasons for the failure are different:

It does not go into the BIOS settings panel, but instead of the settings we see a black screen;

The boot menu does not open, but instead a black screen appears;

Frequent spontaneous reboots of the PC;

When calling the settings or the BOOT menu, there are unclear colored dots on the screen;

USB ports not detected;

CD-ROM disappeared;

Unable to save changes on reboot;

Unable to reset settings to default.

Failure can be caused by:

Power surge when restarting the computer;

Too frequent restart of the computer before the operating system loads;

Interference with the BIOS through the command line or third-party software;

Incorrect CMOS reset, as well as updating or flashing the BIOS of the motherboard;

The first thing you can do without resorting to the help of specialists from the service center is to reset the settings to default. Let’s consider the basic principle, because there are quite a lot of motherboard manufacturers, but on the website of your motherboard manufacturer there are always instructions where everyone can find information about their particular model.

Resetting the settings, as well as the appearance of the utilities that will be described below, may differ depending on the manufacturer, but the principle of user actions is similar for each of the cases.

How to reset the BIOS on the motherboard

Turn off the home computer from the network and wait a minute until the voltage on the motherboard drops. The voltage on the motherboard is not large, but it is quite possible to close the contacts.

Removing the battery

If the three volt battery is already old (more than 3 years old), you can replace it with a new one. To do this, we take out the battery from the motherboard and change it to a new one. And for a normal reset in the BIOS, remove the battery for a few minutes, 5-10 will be enough.

How to reset CMOS

If the method of removing the battery for 10 minutes does not work, then you will need to reset the CLR CMOS (reset BIOS), but do not be afraid of the name, resetting BIOS settings to default values \u200b\u200boften helps.

Before the operation, I recommend that you read the reset instructions on your motherboard model, on the manufacturer’s website, but usually the procedure is performed almost everywhere in the same way. Depending on the model of the motherboard, you will need to close the contacts for 10-20 seconds with a jumper (jumper) or a screwdriver (required with the battery removed!), Or press the button (CLR CMOS), if available.

You should be aware that you need to hold the CLR CMOS jumper or button for at least the time recommended by the manufacturer for your motherboard. Usually it is 10 seconds, but the time can vary up to a minute. It is not recommended to keep the jumper longer than the manufacturer’s recommended time, or reset the CMOS too often. After the actions taken, you need to insert the battery and connect the power.

Hardware reset

In addition to many advantages, the hardware BIOS reset method has one very important drawback. In the event that the warranty period for the computer has not yet expired, you cannot break the seals from the case of the system unit. Since resetting the BIOS requires access to the motherboard, you will need to open the system unit.

Disassembly order:

Locate the power supply button on the case of the system unit and turn it off. If the button is missing, you need to remove the power cable from the connector.

Disconnect the peripherals from the PC.

To remove the side panel of the PC case, you will need to remove the bolts with a Phillips screwdriver and pry it out of the slots.

The laptop is first removed dvd-drive, power supply; unscrew the mounting bolts, remove the back cover.

All hardware that interferes with the operation of the motherboard must be removed.

Reset with jumper

Locate the switch named Clear CMOS, CLRTC, CCMOS, CL_RTC, CL_CMOS near the battery, on a laptop it may be under it. Using a jumper, you can change the operating mode of the device by closing and opening contacts.

Manufacturers usually implement the ability to clear CMOS memory in the form of a two-pin or three-pin connector with a jumper installed. You can reset the bios by closing the contacts with a jumper. In the case of a two-contact configuration, it is put on 2 contacts or removed; for a three-contact configuration, the position is changed: instead of 1-2, there should be 2-3. To discharge the residual electrical charge, hold down the download button for 12 seconds. After that, you need to return the jumper to its original position.

Battery reset

Locate the CR2032 battery on the system board and remove it from the connector. You can get the battery by pressing the holder or latch. CMOS data needs constant power to save; if the battery is missing within 24 hours, the BIOS will be cleared.

After the battery is removed, the PC power button is pressed for 15 seconds, which leads to a complete discharge of the computer from the accumulated electric charge. The bios settings are being reset.

The battery is inserted into the socket with a slight pressure. We again fasten the cover to the system unit, connect the power cord and turn on the power supply. When booting the computer from the BIOS, we set the time, a new password and other settings.

Problems occur when removing the battery on some models of motherboards: additional tools may be required, or the battery may not be removable, do not try to force it out. On some laptop models, there may not be a jumper or a removable battery, or it may be difficult to disassemble.

In addition, on high-quality motherboards, the BIOS can persist for a long time even after the battery is removed from the slot. Therefore, it is better to reset the settings in another way.

When you turn on the computer, two options are possible

First: a BIOS error message will appear and 3 or 4 options will be offered to choose from (possibly in English). Type: «Save BIOS settings», «Load BIOS settings», «Reset BIOS to optimal settings» or «ENTER BIOS» (enter BIOS settings — DELETE key). An ideal option when the settings are reset to default values and performance is fully restored.

Second: the problem, all of the above actions, have not been solved and a BIOS flashing of the motherboard will be required. In this case, if the operating system starts normally, go to the manufacturer’s website and download the latest BIOS (not BETA) and the firmware utility there (you can use the built-in flash driver). The main thing is to accurately determine your motherboard model, the AIDA64 utility will help, and download the latest firmware to it, usually a file with a ROM or BIN extension.

Motherboard BIOS flashing

We reset the BIOS settings to standard, then save the current BIOS (backup.rom) using the firmware program and start the flashing process. Find a new BIOS file and «sew» it, this is a very important point. If you «sew» the BIOS from another model, the motherboard will not work without the qualified help of the masters from the SC or there will be constant failures.

Using the built-in BIOS update tools

If you need a BIOS update utility built into the motherboard, then write the BIOS file to a FAT32 formatted flash drive and enter the BIOS (DELETE or DELETE + F2 key). After launching the utility from the BIOS, you need to select your flash drive and firmware file and actually “sew” it, after which the performance will be fully restored.

You will have to wait until the end of overwriting, do not remove the flash drive and do not turn off the computer! Interrupting the firmware can lead to a complete failure of the microcircuit.

What can be done if the system does not want to start after flashing?

If the motherboard BIOS flashing was not completely successful, you will see a black screen. This means that you flashed the wrong BIOS file and the motherboard, in simple terms, “screwed up”, “covered itself with a copper basin”, in general, broke. What to do? I must say right away that the chance to restore the BIOS without the help of masters from the service center is extremely small, but you can try.

First we need to recover the damaged BIOS. To do this, you can use the CLR CMOS reset (read above if you don’t know how CMOS is reset), usually if you have a DUAL BIOS (dual BIOS) soldered, this can help, there may also be a special button.

For motherboards from ASUS

On ASUS motherboard BIOS flashing is performed as follows. You need to download the BIOS file from the manufacturer’s website and rename it to the exact name of your motherboard model. Then upload the file to a USB flash drive with a capacity of 2-16 GB formatted in FAT32 and name the flash drive «FLASHBACK» or «ROG CONNECT». Turn on the computer by holding the special button on the back of the system unit to restore the BIOS.

For the rest, if the above information did not help, and the motherboard was bought separately from the computer, you can insert the DVD disc supplied with the motherboard into the drive for 5 minutes and turn on the PC immediately after resetting the CLR CMOS (it helps, but not always). On Gigabyte boards, sometimes there is a special BIOS recovery button (Dual BIOS).

And if there is no disk with drivers and system utilities from the motherboard, then the only thing left is a service center or buying a new motherboard with a socket compatible with your processor, otherwise nothing.

How to reset BIOS settings on a computer and laptop? Sometimes situations arise when a laptop or computer stops booting. The machine itself works, but it does not boot to the windows operating system. There can be many reasons for this, but the most common incorrect BIOS settings are the subsystem in which algorithms are set for the device to work, including boot parameters. They may be broken. The way out of this situation is to reset the settings of the basic input-output system.

BIOS reset by installing special jumpers (jumpers) on the motherboard

Naturally, many motherboard manufacturers have provided for the possibility that the user will not be able to clear the BIOS memory using Setup and load standard factory settings in a similar way. Therefore, solutions were built into the design of the boards that allow you to reset the BIOS settings by hardware.

Most often, a special jumper can be used for this purpose. Of course, finding a small jumper on a large motherboard is not always easy. So it’s usually best to look in your motherboard manual to find it.

If you do not have a manual with you, then you should remember that quite often this jumper is marked on the motherboard as Clear CMOS (and therefore this type of jumper is often referred to as Clear CMOS).

Clear CMOS jumper on the motherboard

Also, the jumper is most often found near the battery that powers the CMOS memory. However, this rule is far from always observed, therefore it is more reliable to use the motherboard circuit to find the jumper.

Normally closing the Clear CMOS jumper is enough to reset the CMOS memory. For reliability, it is worth holding the jumper closed for a while. Typically, after a few seconds, the BIOS memory is erased, and after that you can restart the computer.

We hope that all readers know the following principle, but we will remind you of it again: all jumper installation operations must be carried out on a computer completely disconnected from the network, otherwise the results may be deplorable for the motherboard.

When to reset the BIOS settings

It must be understood that this is not a panacea for all diseases. And if you know for sure that you did not change anything in the subsystem settings, then this method will not save you from underloading the system.

Return to default settings should be done if:

When you (or someone else) changed the BIOS settings and after that the system stopped booting;

Forgotten password to enter Windows or subsystem;

If you updated the BIOS and problems started after that;

In the case of overclocking a video card or processor, this is more applicable to older models of computers or laptops, since new ones fix the problem automatically or do not allow overclocking at all.

After a subsystem reset, a factory reset will occur.

BIOS can be reset without disassembling the computer, but if you put a password on the subsystem and forgot it, then you can’t do without opening the “patient”. Let’s look at both methods next.

HOW DOES CMOS MEMORY WORK?

The CMOS memory that stores the BIOS settings is volatile. It is powered by a special battery built into the computer motherboard. This was not done in vain. The default BIOS settings are stored in non-volatile memory and are never changed. All changes made by the user are stored in volatile memory.

The correctness of these settings is very important, because they determine whether the computer boots or not, and as a result, you can change them or not. And if the user made any mistake in the settings, it is enough just to de-energize the memory and the settings will return to the default value. Everything is simple. And now let’s see how to do it.

How to reset BIOS settings on a computer and laptop using the BIOS menu

Subsystems on different machines may differ slightly from each other, but the principle is the same. Of course, if you do not have a UEFI boot, this is an alternative to BIOS, you can read about it here.

Consider the reset algorithm step by step:

1. The first thing to do is enter the BIOS. You can do this with the keyboard keys: Del, F2, F10, F12. Or combinations of keyboard buttons: alt + F2, fn + f2, etc. Depending on the model of your computer or laptop. Usually information about which button to press can be seen when the computer starts.

2. After entering the subsystem, you need to find the button responsible for resetting the settings to the default state. Usually it is called in English like this: «Load Setup Defaults». You can find this menu item in the “smart” menu item (see screenshot). In some subsystems, the demolition of settings is located in the “Exit” tab

3. Click on “Load Setup Defaults”. You will need confirmation of the action. So you need to make a little more effort and click the «OK» button.

4. Save the settings. Go to the «Exit» tab and click on Save Changes and Exit.

An automatic reboot will occur and if the problem was with the BIOS, it will disappear and Windows will be loaded.

There are situations when BIOS reset does not help. The computer won’t boot because it doesn’t know where to boot from. For example, in your factory default settings, you should boot from a USB flash drive, and not from a hard drive.

This problem is solved simply:

1. Go to the Boot tab. We get to the menu where the subsystem boot parameters are set. Numbers from one to three indicate the sequence of boot options.

If the first option is USB, CD-ROM or Disabled, and you need to boot from a hard disk, then in this case you need to change the configuration.

2. Click on the first item in the menu and select the name of our hard drive from the list.

3. Confirm changes. 4. Go to the «Exit» tab and click «Save Changes and Exit».

If the problem was with the BIOS, then all of it will disappear.

Clear CMOS With the «Factory Defaults» Option

The easiest way to clear the CMOS is to enter the BIOS setup utility and choose to Reset BIOS Settings to their factory default levels.

The exact menu option in your particular motherboard’s BIOS may differ but look for phrases like reset to default, factory default, clear BIOS, load setup defaults, etc. Every manufacturer seems to have their own way of wording it.

The BIOS Settings option is usually located near the bottom of the screen, or at the end of your BIOS options, depending on how it’s structured. If you’re having trouble finding it, look close to where the Save or Save & Exit options are because they’re usually around those.

Finally, choose to save the settings and then restart the computer.

Forgot your BIOS password? Let’s open the computer!

It happens that you need to reset the settings, but you completely forgot the password. In this case, only «opening» will help. In fact, the process is not complicated and useful (at the same time, you can clean the computer from dust).

Attention! If the laptop or computer is under warranty, then bring it to a service center, otherwise you will lose the possibility of warranty service.

We will consider the situation on a PC, but for a laptop the algorithm is basically the same, just the details are smaller and more difficult to get to.

There are two methods:

1. CMOS tablet. 2. Jumper on the motherboard. Let’s consider both methods.

Buttons on the rear panel

Some boards may contain a button on the rear panel, pressing which will reset the BIOS:

Quite convenient, no need to disassemble the PC case, look for jumpers. Everything is fast enough.

The button may not be signed, in which case it is better to look on the Internet on the off site for information about your board (or read the instructions).

Reset BIOS using CMOS

For a desktop computer, this is the fastest and safest way to reset BIOS to factory settings. It is more difficult to deal with a laptop, since its case is very easy to damage.

Consider a step-by-step algorithm for a computer:

1. Be sure to disconnect the PC from the network. 2.Next, you need to open the starboard side of the computer.

3. Find the treasured battery:

4. Take a screwdriver and carefully press the latch. The battery should pop out easily.

5. We are waiting for 10-15 minutes. This time is necessary for the subsystem to forget everything that was done with it after the store. We insert the battery correctly — with the inscriptions up. We collect the computer, turn it on and rejoice!

PC Overview » Motherboard

CLR_CMOS (Clearing CMOS Jumper)

CLR_CMOS (Clearing CMOS Jumper)

Using the Clearing CMOS jumper, you can clear the contents of the CMOS parameters, in particular, return the BIOS settings to factory defaults. To clear the contents of the CMOS, short the two pins for a few seconds using a jumper wire or a metal object such as a screwdriver.

. • To avoid the risk of damage to the equipment, turn off the PC and unplug the power cable from the power supply before starting the CMOS cleaning procedure.

Reset the subsystem with a jumper

This method is more suitable for a personal computer. On a laptop, the jumper is almost never found.

You need to find the following jumper in the computer system on the motherboard:

It can be signed by CMOS or CLRTC. You can find it easily. The question arises — what to do with it? The answer is simple — close. There are different jumpers, for example, I have 2 bare contacts. To reset the settings, close the contacts with something conductive (screwdriver).

There are also three-pin jumpers with a jumper.

The jumper closes the first 2 contacts. To reset the BIOS using the jumper, you need to remove it and rearrange it side by side, closing the 2nd and 3rd pins.

Position 1 Position 2

There are rarer cases when there are more contacts. But that’s not a problem. It is also easy to close them to reset the subsystem. This diagram will help you:

Jumpers are also found in laptops, but very rarely. Look for CMOS, CLRTC or something similar. If you find it, you’re in luck. You just need to close the contacts. The principle of closure is exactly the same as on a computer.

Intel motherboards

Everything is not so simple here — to reset the BIOS, you need:

Find the BIOS Configuration Jumper, it must have 3 connectors (pin).

Two will have a jumper.

It is necessary to remove it, then turn on the PC.

After Windows loads, turn it off.

Reinstall the jumper.

It is possible that after removing the jumper, the PC will not boot Windows, but will give a signal / message that the BIOS has been reset. Then turn off the computer through the menu or, in extreme cases, from the outlet (although undesirable). Then put the jumper back and turn on the PC.

If it doesn’t help, then:

Set the CLRTC jumper to connectors 2-3.

Turn on the PC.

After passing the test/POST, the bios should open itself in diagnostic mode, where you can reset the bios.

After — turn off the PC and install the jumper back into the 1-2 connectors.

Perhaps on Intel boards it may be a little different — without a jumper, it means that the board will start the BIOS in the configuration / diagnostic mode. In any case, it is worth looking at the manual for the motherboard.

UEFI

What is EFI?

EFI (from the English «Extensible Firmware Interface») — an extensible firmware interface (firmware) — software that provides interaction between the operating system and firmware that directly controls the computer hardware. The main purpose of EFI is to correctly initialize existing hardware and transfer control to the operating system loader.
The EFI specification was originally created for the first Intel systems — HP Itanium in the middle of 1990s. The EFI 1.02 specification was released by Intel on December 12, 2000.

What is UEFI?

UEFI (from the English «Unified Extensible Firmware Interface») — a unified extensible firmware interface (firmware) — an EFI version for the Intel x86, Intel x64 and ARM architectures. It is positioned as a replacement for the BIOS in personal computers.
UEFI is currently developed by the Unified EFI Forum. The latest version of UEFI 2.5 was adopted in April 2015.

In fact, EFI / UEFI is some kind of operating system, with its services, drivers, support for drives and file systems (including FAT32) and with its own graphical shell (EFI shell). The shell can be used to execute various EFI applications such as system setup, OS installation, diagnostics, firmware upgrades. EFI shell commands allow you to copy and/or move files and directories on supported file systems, and load and unload drivers. The shell can also be used to, for example, play a CD/DVD or access the Internet (without booting the «main» OS), provided that the EFI applications support these features.

In other words, the EFI shell is a functional replacement for the BIOS text interface and the DOS command line interpreter.

You can download all the necessary programs for working with UEFI from the corresponding section of our file archive.

Material still in progress…

A lithium battery is installed on the system board to power the computer’s non-volatile configuration memory (
CMOS
). The term of its work is enough for several years. The need to replace it is indicated by message
“CMOS Battery State Low” or “CMOS Checksum Error”
during POST (
Power On Self Test
) The first signs of battery replacement may be the internal clock-calendar has stopped or the settings are lost
SETUP
when the machine is turned off.

On older motherboards, the battery was usually a blue barrel soldered to the board. In recent years they have been failing on motherboards 286

and
386
machines. In this case, information is lost
CMOS
, but what is much more dangerous, the electrolyte can leak out, causing the circuits to close and corrode the motherboard elements. The leaked battery must be unsoldered, and the board in that place should be cleaned with a brush and rinsed. It can be difficult to find a new battery of the same size, but it can be replaced with any other with a similar voltage (usually 3-4.5 V). A new battery can be connected to the contacts of the external battery connector (Ext. Bat.), available on most motherboards (see Fig. 1b), by removing the internal battery power jumper and be sure to observe the polarity of the connection. There are external batteries for the PC, enclosed in plastic cases with connection wires. This case is fixed with Velcro in a convenient place.
It is possible to use a simple and reliable home-made reusable option: two metal pushpins with soldered wires are stuck into a wooden clothespin, and a coin cell battery (for example, type 2732) is clamped with them, strictly observing the polarity. Fixing such a design in the case is quite simple.
Note: Lithium batteries should never be recharged, they tend to explode when charged and can damage the inside of the computer.

Modern motherboards often use a coin cell battery in a special holder that is easy to replace.

The external battery connector is also used for zeroing CMOS

. Such a need may arise, for example, if you lose the input password in BIOS Setup (or if you need to reset it). Usually for this it is enough to move the jumper to the position shown in fig. 1c.

Fig. 1. Connecting an external battery and resetting CMOS: a — operation from an internal battery, b — from an external one, c — resetting CMOS

Sometimes a separate jumper or switch is used to reset the password (it is used if the password is not stored in CMOS and in
NVRAM
). In this case, by switching the jumper, the computer must be turned on — only then the password will be reset, after which the jumper must be returned to its original state.

Zeroing
CMOS
should be used with care. The configuration information that is stored there is relatively easy to restore — problems can only arise with non-standard manual hard drive settings. In addition to Setup information, in
CMOS
the key for binding any application software to a specific motherboard can be written, and when resetting
CMOS
the key will be lost. So, for example, it is easy to “kill” a legal copy of package
“1C-Accounting”
. To insure against such troubles, after installing such protected products, you should save the contents of
CMOS
to the file. This allows you to do, for example, the test package
QAPlus.
However, there are times when the password cannot be reset using these standard methods. Then there is another way: short-circuit the pins of the CMOS memory chip

with the power off (!) and the battery disconnected. To do this, a piece of foil is applied from above to the microcircuit and gently smoothed with a fingernail to the leads along the perimeter of the case. In old motherboards
286, 386
and some
486

CMOS memory chip
has
14 — 16 pins. In these cases it is sufficient to short the power pins (usually
7 to 14
for 14-pin ICs and
8 to 16
for 16-pin ICs).

Intermittent destruction of information CMOS

at power on may not be caused by the battery, but by insufficient signal delay
Power Good
regarding the moment of establishing the supply voltage or, conversely, an excessive delay of this signal after switching on the source. Determining the cause is pretty easy. If you hold down the Reset button before turning on the power and release it only after a few seconds, this in most cases simulates an increase in the delay of the signal
Power Good.
If data is still lost
CMOS
, check the release delay version. To do this, the Reset button should be pressed before turning off the power and held for a few more seconds — this imitates the acceleration of signal removal
Power Good
. If the data
CMOS
is saved with this method of shutting down, the matter is a large delay when turning off. In both cases, the power supply needs to be replaced or repaired.

Hello dear friends! Users, having set a password on Bios, often forget it. Only here it is impossible to enter the system without typing the password. I decided to write about how the BIOS password is reset in this article.

This is what the monitor looks like when prompted for a password:

Jbat1 on the motherboard what is it

Reset the BIOS by contact closure

Your computer’s basic hardware and time settings are stored in the BIOS and if for some reason you have problems after installing new devices, you forgot the password or just that — something is not configured correctly, you may need to reset the BIOS to default settings.

In this manual, I will show examples of how you can reset the BIOS on a computer or laptop in cases where you can get into the settings and in a situation where this cannot be done (for example, a password is set). Examples for resetting UEFI settings will also be given.

Reset BIOS in the settings menu

The first and easiest way is to go into the BIOS and reset the settings from the menu: in any interface option, such an item is available. I will show several options for the location of this item, so that it is clear where to look.

In order to enter the BIOS, you usually need to press the Del key (on a computer) or F2 (on a laptop) immediately after turning it on. However, there are other options as well. For example, in Windows 8.1 with UEFI, you can get into the settings using advanced boot options. (How to enter BIOS Windows 8 and 8.1).

In older BIOS versions, the main settings page may contain items:

Load Optimized Defaults — reset to optimized settings

Load Fail-Safe Defaults — reset to default settings optimized to reduce the likelihood of failures.

On most laptops, you can reset BIOS settings on the Exit tab by selecting Load Setup Defaults.

On UEFI, everything is about the same: in my case, the Load Defaults item (default settings) is located in the Save and Exit item (save and exit).

Thus, regardless of which version of the BIOS or UEFI interface is on your computer, you should find the item that serves to set the default parameters, it is called the same everywhere.

Reset BIOS settings using a jumper on the motherboard

Most motherboards are equipped with a jumper (otherwise — a jumper) that allows you to reset the CMOS memory (namely, all BIOS settings are stored there). You can get an idea of \u200b\u200bwhat a jumper is from the picture above — when the contacts are closed in a certain way, certain parameters of the motherboard operation change, in our case it will be a BIOS reset.

So, to reset you will need to follow these steps:

Turn off the computer and power (switch on the power supply).

Open the computer case and find the jumper responsible for resetting the CMOS, it is usually located near the battery and has a signature like CMOS RESET, BIOS RESET (or abbreviations from these words). Three or two contacts can be responsible for the reset.

If there are three pins, then move the jumper to the second position, if there are only two, then borrow the jumper from another place on the motherboard (don’t forget where) and install it on these pins.

Press and hold the computer’s power button for 10 seconds (it won’t turn on because the power supply is turned off).

Reset the jumpers, reassemble the computer, and turn on the power supply.

This completes the BIOS reset, you can install them again or use the default settings.

Reinstalling the battery

The memory that stores the BIOS settings, as well as the motherboard clock are not non-volatile: there is a battery on the board. Removing this battery causes the CMOS memory (including the BIOS password) and the clock to be reset (although sometimes you have to wait a few minutes before this happens).

Note: sometimes there are motherboards where the battery is not removable, be careful not to overdo it.

Accordingly, in order to reset the BIOS of a computer or laptop, you will need to open it, see the battery, remove it, wait a bit and put it back. As a rule, to remove it, it is enough to press on the latch, and to put it back, just press lightly until the battery itself snaps into place.

How to reset the BIOS — for sure, this question has often come up on edge for many users of a personal computer. A procedure such as resetting BIOS settings can be extremely useful in cases where a reboot does not help the computer and, as it seems, it can no longer be revived by the user, and the only way to restore the PC to working capacity is a visit to the repair shop. Since resetting the BIOS returns the factory default settings, this method often solves problems related to the PC not functioning properly.

You may need to reset BIOS settings for various reasons. For example, it may happen that you experimented with computer hardware as part of a processor overclocking exercise, and as a result, your computer simply stopped booting. Or you need to reset the password that prevents you from entering the BIOS. In short, the reasons may be different. The methods for resetting the BIOS can also vary, and not every method can be applied in every situation. But better about everything in order.

BIOS reset methods

All BIOS reset methods can be divided into two main categories: hardware and software. The most well-known methods at the moment include the following:

Reset BIOS to default settings using BIOS Setup.

Reset by setting special jumpers on the system board.

Reset by removing the system board battery.

Reset by closing specific pins on the BIOS chip.

Reset via programming ports.

Consider these options in more detail.

Reset BIOS to default settings using BIOS Setup

The easiest way to reset the BIOS is to start with this software method. To implement it, just enter Setup (usually by pressing the Delete key on the keyboard when the computer boots), find the appropriate section, select the desired option and restart the computer. After the reboot occurs, the factory default settings are activated in the BIOS. The option to load default BIOS settings is available in almost every BIOS version. Usually it is called Load Defaults or something like that.

Everything seems to be simple, but there are some limitations. The thing is that it will be difficult for you to apply this method if you cannot enter BIOS Setup — for example, when your computer does not boot at all. A similar situation also occurs when an unknown password interferes with entering Setup or continuing to work with the computer after booting. Thus, the functional usefulness of the described method is limited.

BIOS reset by installing special jumpers (jumpers) on the system board

Naturally, many motherboard manufacturers have foreseen the possibility that the user will not be able to clear the BIOS memory using Setup and load the standard factory settings in a similar way. Therefore, solutions were built into the design of the boards that allow you to reset the BIOS settings by hardware.

Most often, a special jumper can be used for this purpose. Of course, finding a small jumper on a large motherboard is not always easy. So it’s usually best to look in your motherboard manual to find it.

If you do not have a manual with you, then you should remember that quite often this jumper is marked on the motherboard as Clear CMOS (and therefore this type of jumper is often referred to as Clear CMOS).

Clear CMOS jumper on the motherboard

Also, the jumper is most often found near the battery that powers the CMOS memory. However, this rule is far from always observed, therefore it is more reliable to use the motherboard circuit to find the jumper.

Normally closing the Clear CMOS jumper is enough to reset the CMOS memory. For reliability, it is worth holding the jumper closed for a while. Typically, after a few seconds, the BIOS memory is erased, and after that you can restart the computer.

We hope that all readers know the following principle, but we will remind you of it again: all jumper installation operations must be carried out on a computer completely disconnected from the network, otherwise the results may be deplorable for the motherboard.

BIOS reset by removing the CMOS battery from its socket

If there is no corresponding jumper on the motherboard (or you could not find it), but there is a CMOS battery on the board, you can try resetting the BIOS memory in the following way – simply remove the battery from its socket. However, this method is not always as effective as it might seem at first glance. The fact is that CMOS memory usually does not require much power to operate and therefore the BIOS data located in this type of memory can be stored in it for a long time even without power. Therefore, in order to make sure that you managed to completely clear the BIOS memory, you need to hold the system unit without a battery for a while. Usually, the CMOS memory is completely cleared after a day, although very often a shorter period of time may be enough for this.

CMOS battery layout

The CMOS battery is usually quite easy to find on the motherboard — it is usually made of shiny metal and has a 1 cm round surface. holds the battery in the slot.

Like the jumper operation, removing the CMOS battery can only be done when the computer is completely disconnected from the network.

However, it should be borne in mind that the battery is not always made in a removable form. Quite often, especially on a laptop, it is simply impossible to remove the battery without damaging the motherboard. In this case, the only way out for the user is often a trip to the service center.

Other ways to reset the BIOS

If none of the above methods helped you, and you do not know how to clear the BIOS memory, then in some cases you can try other methods. However, they are not as reliable and you can only use them at your own risk.

First of all, it is worth noting that such a frequently mentioned BIOS reset method as closing the BIOS battery contacts is unlikely to help you. Moreover, if you use it, it will be fraught with failure of the motherboard.

However, for some BIOS chips, the short circuit of certain pins of these chips sometimes brings a positive result. Below we provide a list of the relevant microcircuits and the procedures that must be performed with them to reset the BIOS:

82206 Chip — closing contacts number 12 and 32 (or 74 and 75).

F82C206 Chip — shorting pins 3 and 26.

Dallas DS1287A, DS12887A, Benchmarq bq3287AMT — shorting pins 12 and 21.

Motorola MC126818AP, Hitachi HD146818AP, Samsung KS82C6818A — closing contacts 12 and 24 (it is also possible to pull the chip out of the socket).

Dallas DS12885S, Benchmarq bq3258S — shorting pins 12 and 24 (or 12 and 20).

When performing actions to close the contacts of microcircuits, you should follow a few simple rules. First of all, it is worth remembering that all operations with microcircuits should be performed only when the power of the computer motherboard is turned off! In addition, often just closing the contacts may not be enough to reset the BIOS, so it’s best to keep the contacts closed for a few seconds.

In addition to the BIOS reset hardware, as well as reset using the Setup program option, there are purely software methods based on writing a certain set of data to the computer’s ports. Firstly, special utilities can be used for this purpose. But if you do not trust programs downloaded from the Internet, then you can create a similar program yourself. The easiest way to do this is to use the Debug utility included with MS Windows. To carry out the operation to clean the BIOS of manufacturers AMI or AWARD, just run the Run program and enter the following set of commands:

After entering these commands, a restart of the computer is required.

Features of resetting BIOS for a laptop

How to reset BIOS — this question arises no less often for users working on a laptop than for those users who use a desktop PC for work. However, on a laptop, this operation is usually somewhat more difficult. In many cases, the same methods can be used on a laptop as on a desktop PC. However, often on a laptop, a user may encounter enhanced BIOS data protection, especially on a top-class laptop. In this case, to perform a BIOS reset operation on a laptop, it is best to contact specialists.

Conclusion

Any user can benefit from information on how to reset BIOS settings. If your computer is not showing signs of life, is malfunctioning, or you cannot boot it because you do not know the password, then in this case, do not despair. Resetting the contents of the BIOS to factory settings in most cases will restore the computer to working capacity.

There are many ways to reset the BIOS settings, and the most reliable and universal of them are hardware methods, such as setting jumpers on the motherboard or removing the CMOS battery.

In this note I will write how to reset (clear) the BIOS. The article is intended for beginners.

So, for some reason, we need to reset (clear) the BIOS. Or, as they sometimes say, make «clear cmos» (clear_cmos).

To facilitate this step, some high-end and mid-range motherboards are provided by the manufacturer with buttons that allow you to clear the CMOS data almost instantly.

They are usually labeled «clr_cmos» (clear_cmos).

They can be located both on the front of the board itself:

They can also be located on the back of the motherboard:

this «quick reset button» to clear the BIOS will be at the end of the note].

But on ordinary motherboards (of which

99% of the total number) there are no such «conveniences». But there is no reason to be upset — absolutely every motherboard has a three-pin connector. This connector is just designed to clear the BIOS (CMOS).

They may look like this:

As you can see in all three pictures, a two-pin jumper (or jumper) is installed on the three-pin connector. The jumper can close only two of the three contacts. For all motherboards (and hard drives, by the way), these jumpers are absolutely standard — identical, that is.

This is how the jumper (jumper) looks like:

They can be found both on the motherboard itself — in the box or on the motherboard itself, where it is already installed on the three-pin connector in position 1-2 (as you can see in the three pictures above). Like in the photo below:

Or find the jumper on the hard drives, where it is already set to some position.

But — manufacturers usually do not install any jumpers on modern motherboards. Then you need to look for them in the store where you bought the motherboard — ask for one thing — and they will give it to you for free.

In this particular case, we will consider the MSI P67A-C43 motherboard.

It looks like this:

On modern boards, the three-pin connector for clearing the kmos is labeled «JBAT1» (presumably Jumper Battery 1). Looking for her:

Found her. What need to do?

1. Turn off the computer beforehand.

2. Switch the button on the power supply unit (PSU) to position «0».

3. Unplug the 3-pin plug from the power supply cord from the «ass» of the PSU.

4. Wait then about 15 seconds and then take the jumper and bridge pins 2-3. Photo below:

If the jumper is already in position 1-2, then the jumper should be moved from position 1-2 to position 2-3. Bottom photo:

5. Wait seconds 5. Then return the jumper back to its original position 1-2. Even if there was no jumper, let it remain in position 1-2 anyway.

This is normal as the 1-2 jumper position is standard/nominal working.

Never leave the jumper in position 2-3! This is fraught with unpleasant consequences for the performance of the motherboard!

6. After setting the jumper in position 1-2, you can turn on the computer. Bios as they say «virginally pure».

P.S. Now about how to reset the BIOS using the «quick button».

We do the same actions as above, but instead of «dancing with jumpers» we just press the button.

CAUTION. When the computer is turned on, pressing the «clr_cmos» button is strictly not recommended, because it is fraught

JBAT1: Clear CMOS Data Jumper

The board has a battery-powered CMOS memory for storing

system configuration data. Using the CMOS memory, the operating system (OS)

is automatically loaded every time it is turned on. To reset the

system configuration (clear the CMOS memory data), use this

Clear the CMOS memory by closing the specified contacts

with a jumper when the mode is off. Open after cleaning

jumper. Clearing CMOS memory while the system is running is not allowed.

What is the purpose of the jbat1 connector on the motherboard?

Owners of MSI motherboards, when studying in detail the connectors available on it, could pay attention to the connector with the signature jbat1. It is usually located near the battery and has a jumper on it, set in the closing position of the leftmost contacts.

In this article we will tell you what the jbat1 connector on the motherboard is for and in what situations it should be used.

The main and only purpose of the connector

To begin with, we note right away that jbat1 is by no means intended for connecting cooling fans!

It stands for Jamper battery and is used to reset the BIOS (UEFI) settings. It is an analogue of the Clear RTC connector, which has the same purpose. It’s just that MSI chose the name jbat1.

When should it be used?

This switch can help out in a situation where your computer simply refuses to turn on. For example, when you turn on, instead of loading the operating system, you see a black screen, or after pressing the power button, nothing happens at all.

In this case, you need to do the following:

Turn off the computer and pull out the thick black power cord that goes from the socket to the power supply.

Wait a minute and then move the jumper on the jbat1 connector to the adjacent pins on the right.

Clr_Cmos: How To Clear CMOS On Your Motherboard?

How To Clear CMOS On Your Motherboard?

How to Reset Your CMOS and Why You Might Need To

Resetting Your CMOS with a Case Button

Resetting Your CMOS with a Motherboard Button

Reset Your CMOS by Reseating the CMOS Battery

Reset Your CMOS with the Motherboard Jumper

How to Clear CMOS on an ASUS Motherboard | Small Business

Understanding BIOS and CMOS

Dealing With BIOS Issues

Reset CMOS on ASUS Motherboards

Removing the Battery

que es y cómo hacerlo PASO A PASO ??

Antes de comenzar, un par de conceptos

Qué es la memoria CMOS

Qué es la BIOS de nuestro sistema

Las implicaciones del vaciado de la CMOS (Clear CMOS)

Cómo realizar el Clear CMOS en nuestro equipo

Realizar el reinicio desde la BIOS de nuestro sistema

A través de la conexión física de nuestra placa

Retirando la batería

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ΪƼ

How to reset the BIOS and revive the computer

1. How to reset the BIOS through the software interface

2. How to reset the BIOS using the jumper or button on the board

3. How to reset the BIOS using a removable battery

Wake-On-Lan

Clear cmos jumper where it is located. Power and reset CMOS memory. What is Flash ROM

Clear CMOS

What are POST-Codes?

Motherboard battery

Do I need to change the battery?

Basics

What is a CPU?

Motherboard form factor

What is Flash ROM?

BIOS

What is a BIOS?

What is an EPROM?

What is EEPROM?

What is Flash ROM?

What is CMOS?

What is a CMOS Battery?

Do I need to change the battery?

What is Clear CMOS?

What is RTC?

What is Clear RTC?

What is POST?

What are POST-Codes?

What is BIOS Setup?

What is ESCD?

What is ACPI?

BIOS Software Manufacturers

UEFI

What is EFI?

What is UEFI?

How to make Clear CMOS

1. Clear CMOS using the «factory defaults» option in BIOS

2. Clear CMOS using battery

3. Clear CMOS via jumper on motherboard

How to reset the BIOS to factory settings

What is the BIOS

Consequences of a BIOS failure

How to reset the BIOS on the motherboard

Removing the battery

How to reset CMOS

Hardware reset

Reset with jumper

Battery reset

When you turn on the computer, two options are possible

Motherboard BIOS flashing

Using the built-in BIOS update tools

What can be done if the system does not want to start after flashing?

For motherboards from ASUS