Since you've isolated the behavior to be outside of any specific OS, and you've swapped every piece of hardware but the mobo, I think that's your culprit. Might try pulling the clear CMOS jumper, just to be safe.
All peripherals were disconnected? Have you also tried installing with NO PCI cards inserted, just the AGP card and one stick of RAM? If so, I'd concur with the assertion of a bad motherboard.
alc6379
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