Computer Hardware
You get a CMOS checksum error during bootup. What is most likely the cause?

hard drive types are incorrectly defined
CMOS battery is nearing end of life
power supply is bad
BIOS needs updating

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Computer Hardware
You run a super wing-ding diagnostic program on your PC, and it reports that your hard drive, microprocessor, RAM, and video card have seen better days. To resolve this problem you should:

replace each part one at a time, rerunning the diagnostic before replacing the next part.
run an exhaustive memory check
check to see if you have a software problem
get another copy of the diagnostic program
replace everything at once and rerun the diagnostic

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