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

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

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Computer Hardware
Whenever you have a hardware resource conflict, it will more likely be an IRQ conflict rather than an i/o conflict because:

there are a lot more I/O addresses than IRQs.
the BIOS sometimes has more of a problem controlling IRQs
I/O addresses cannot conflict
software tends to mess up IRQs
software tends to correct I/O conflicts

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