Computer Hardware
Your IDE hard drive is not spinning up when you turn on the PC. What is the most likely problem.

incorrect jumper setting on drive
virus
tfad system board
loose molex connector
bad data cable

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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:

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

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