A rather frequent error on PCs is the one that is displayed on startup, if the word CMOS Checksum Error or CMOS Checksum Bad appears, with two or three options, one to go on pressing F1 and the other to load the default values, with F2 and a key to start the BIOS setup.
This type of error, which almost certainly depends on a PC BIOS problem, cannot be resolved with a restart or even pressing F1, but may require the replacement of an internal part, that is the CMOS battery.
CMOS stands for complementary metal-oxide semiconductor and is a battery-powered semiconductor chip on the motherboard that stores all the BIOS information.
This is the first program that runs when you turn on your computer, responsible for initializing and verifying hardware such as the CPU, memory, keyboard, mouse, etc.
The CMOS Checksum Error or CMOS Checksum bad is displayed when the CMOS content is not checked in the Checksum, i.e. if the CMOS is unable to store data due to a malfunction .
Although there may be other causes, in most cases the error is simply due to the exhaustion of the buffer battery that powers CMOS, which is nothing more than a button battery to change.
The first thing to do in case of CMOS Checksum error is to access the computer BIOS to verify that the date and time in the BIOS are set correctly .
To enter the Bios you need to press a key repeatedly as soon as you turn on the PC and this key is different depending on the model of the computer (it is better to search the internet).
Usually under the CMOS Checksum Error is written which key to use to enter the BIOS or Setup.
If the time was incorrect, it means that the battery is dead and is the cause of the problem.
Replacing the CMOS battery is really simple and undemanding.
You only have to open the computer case and locate, on the motherboard, a small round battery that will only have to be replaced with a new battery, which can also be compared on Amazon.
If after replacing the battery the problem persists or if there is not a problem of busted time that leads to think that the battery is exhausted, the CMOS Checksum Error could be solved with a reset of the Bios .
The reset can be done directly from the BIOS, looking for the option that reports the factory values.
When it is written whether to use the BIOS defaults, press the Y key to confirm and press Enter.
Turn off the computer and restart to check if the problem persists.
If the problem has not yet been resolved, there may be a hardware problem on the motherboard that is difficult to resolve, although there is still one last chance to resolve the CMOS Checksum Error by doing a BIOS update .
As seen in the BIOS update guide, you need to download the firmware from the BIOS manufacturer's website or from the motherboard's website and follow the instructions that are different for each computer.
READ ALSO: Black screen error with cursor when starting the Windows PC: solutions
This type of error, which almost certainly depends on a PC BIOS problem, cannot be resolved with a restart or even pressing F1, but may require the replacement of an internal part, that is the CMOS battery.
CMOS stands for complementary metal-oxide semiconductor and is a battery-powered semiconductor chip on the motherboard that stores all the BIOS information.
This is the first program that runs when you turn on your computer, responsible for initializing and verifying hardware such as the CPU, memory, keyboard, mouse, etc.
The CMOS Checksum Error or CMOS Checksum bad is displayed when the CMOS content is not checked in the Checksum, i.e. if the CMOS is unable to store data due to a malfunction .
Although there may be other causes, in most cases the error is simply due to the exhaustion of the buffer battery that powers CMOS, which is nothing more than a button battery to change.
The first thing to do in case of CMOS Checksum error is to access the computer BIOS to verify that the date and time in the BIOS are set correctly .
To enter the Bios you need to press a key repeatedly as soon as you turn on the PC and this key is different depending on the model of the computer (it is better to search the internet).
Usually under the CMOS Checksum Error is written which key to use to enter the BIOS or Setup.
If the time was incorrect, it means that the battery is dead and is the cause of the problem.
Replacing the CMOS battery is really simple and undemanding.
You only have to open the computer case and locate, on the motherboard, a small round battery that will only have to be replaced with a new battery, which can also be compared on Amazon.
If after replacing the battery the problem persists or if there is not a problem of busted time that leads to think that the battery is exhausted, the CMOS Checksum Error could be solved with a reset of the Bios .
The reset can be done directly from the BIOS, looking for the option that reports the factory values.
When it is written whether to use the BIOS defaults, press the Y key to confirm and press Enter.
Turn off the computer and restart to check if the problem persists.
If the problem has not yet been resolved, there may be a hardware problem on the motherboard that is difficult to resolve, although there is still one last chance to resolve the CMOS Checksum Error by doing a BIOS update .
As seen in the BIOS update guide, you need to download the firmware from the BIOS manufacturer's website or from the motherboard's website and follow the instructions that are different for each computer.
READ ALSO: Black screen error with cursor when starting the Windows PC: solutions
