CMOS Checksum Errors

How to Deal With CMOS Checksum Errors

A checksum is actually a code that detects error. It is made to protect your BIOS settings and is kept in the CMOS (Complementary Metal Oxide Semiconductor) memory.

Whenever you reboot the system, the checksum is recomputed. After that, it is checked for its counterpart stored value. These two should match. When they don’t, you will receive an error message informing you that the memory of your CMOS could have been corrupted.


Understanding BIOS


Different BIOS have different reactions with regards to the CMOS checksum error. You may be warned, but the settings would still be kept for future operations.

Sometimes, you will still experience your BIOS even if the CMOS settings were corrupted. What happens next is that your BIOS will load and run default values which are stocked in its chip. You just need to be wary of how the error message is phrased so that you know which of the two paths your BIOS have taken.


Understanding the Cause


CMOS Checksum errors are usually caused by a battery that’s too weak to function. Either it is losing power or there is a problem with its connection. Very rarely, it can also be a product of viruses or problems in the motherboard.

It is best to keep a CMOS settings backup copy. When you experience CMOS checksum errors, the backup has the capability to restore settings to their correct values. With this, the problem will just “undo” itself.


Other Promising Solutions

Recheck the battery. Make sure if it is really the cause of the problem. If it’s already losing power, replace it. Do not buy cheap batteries. They might be the cause of your checksum errors next time around.

Ensure a virus search. The good thing about CMOS is that viruses cannot live in them. However, they may corrupt its memory.

Recheck your motherboard. Although it’s rare that motherboard problems cause CMOS checksum errors, other problems can still arise with a faulty motherboard.

Recheck power supply. This may not directly cause the CMOS checksum error but a poor power supply will lead to motherboard problems. This will also lead to the corruption of your CMOS.

Make it a habit to ensure that the BIOS settings in your system are accurate when you reboot the system. Triple-check if you can.