PC Forums

The most common cause of checksum errors in CMOS is a battery that is losing power.  You can buy CR2032 battery. You can buy any brand as long it's a CR2032.

But before buying a battery try to goto the BIOS first then press the "Load Default Settings" many times then save it. If the problem persist then that's the time you'll need to change the battery. If still problem persist then you can update the BIOS. Just search the model of your motherboard then find the BIOS link of your motherboard.

Viruses can also affect CMOS settings, so try to scan also your computer to ensure. Motherboard problems can also affect the stored values