How to fix CMOS checksum error: Windows 10

How to fix CMOS checksum error: Windows 10

When a CMOS checksum error occurs during system startup, it could mean that the system has been restored to default factory settings. The CMOS contains data related to BIOS and may have been reinitialized, causing this error. This tutorial will walk you through how to get rid of this error.

What is the CMOS checksum error?

The CMOS checksum error appears when the information on the CMOS is corrupt. Common causes of the checksum error are when the CMOS battery is dead. Without this battery, the CMOS can't store information. Another reason for the checksum error is that a power surge has caused a loss of power. Fortunately there are several ways to fix the CMOS checksum Error:

  • The first is by restarting your computer. This should create a new checksum and remove the error. If the error persists you can try the other options. 

  • The second is by changing the BIOS battery. The CMOS battery is a small pin found on the motherboard. You can either refer to the manual provided with your motherboard to change it or have a computer technician change it for you. If you'd like to try to do it yourself, refer to our article on the subject.
  • Another is by reinitializing the BIOS. Certain motherboards allow you to reset the BIOS settings directly with a switch. If not, simply removing the battery will cause a power loss to the motherboard, and the CMOS will reset.
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