CMOS checksum is invalid (bluescreen)

[smitty267]

lately, my all in one computer has been crashing ..yesterday it happened after a windows update, I have to do a hard restart to get it going. thats where I encounter a blue scree .." The CMOS chechsum is invalid.  The CMOS will reset to the default configuration" and so on. Its happened a few time now.  Amny ideas on whats happening and how to prevent it? Thanks

[itsmyname]

How old is the small (size of a CDN $0.25 coin) battery on the motherboard? 

If the battery has failed, it no longer provides any "trickle" of voltage to the CMOS, and the values stored in the CMOS have been lost, which generates that error-message.

Replace the battery,.

Cost will be under $5, if you do it yourself.

[smitty267]

Only a couple of years old. Thanks for the reply