What do you Mean by "CMOS checksum error"???

Dec 17, 2015
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What do you Mean by "CMOS checksum error"???
When i boots my computer it shows above massage, then says Press 'f1' to continue, but it shut down then

Only through Bios i can achieve my operating system(s)

I am using a MCP73M05 mother board with 2gb DDR2 ram, and running Windows XP, Windows 7 and also Windows 8.1

(I think my CMOS has died)

 
Solution
How long has it been since you changed your CMOS battery? The message could mean that the settings in BIOS are reverting back to default due to a dead, weak, or dying battery.