The software on the motherboard is called the BIOS.
The BIOS controls aren’t saved on the hard drive.
They’re on a chip called the CMOS.
When the computer starts, it reads the state it was last in from the CMOS.
Usually, it can read the information and restore itself without an issue.
A CMOS Checksum error comes up whenever the computer isn’t able to read that information.
One of the more common causes of a checksum error is also the simplest to solve.
The battery that powers the CMOS is a watch battery, and it can run out of power.
When the battery is dead, the CMOS can’t store information anymore.
Power surges and sudden losses of power are other causes.
Power surges can also cause corruption or hardware damage.
The final cause is less common, but it can happen.
If the BIOS is damaged or corrupted, it will cause a mismatch between the BIOS and CMOS.
It’s uncommon but possible for a virus to infect and corrupt the BIOS.
How to Fix CMOS Checksum Errors
Restart the computer.
A normal restart usually creates a new checksum and eliminates the error.
An error lingering after a normal restart requires some more work.
Download and flash a BIOS update.
Download the update from the motherboard manufacturer’s website.
The loss of power causes everything in the CMOS to reset.
Replace the CMOS battery.
If the cause is a dead battery, all you need is a new one.
The CMOS battery is located on the computer’s motherboard.
Consult a technician or computer repair expert.
If all of the above fail, the problem may be due to hardware damage.
FAQ
Achecksumis an algorithm used in many programs to confirm the integrity of a file.
This is used frequently in downloaded programs to confirm the file hasn’t been tampered with or corrupted.
Try usingWinZipto repair the file.
To do this, right-press the file and selectExtract file.
Next, go toMiscellaneousand place a checkmark next toKeep Broken Filesthen choose an extraction location and selectOK.
