First thing that comes to mind (assuming you're on Windows and connected to some sort of network) is network traffic. Go into the Device Manager and check the Properties of your Network Adapter. In the Power Management tab there is a checkbox to "Allow this device to bring the computer out of...
Have you tried clearing the CMOS via the reset jumper? I've seen old boards with run-down batteries have the Bios settings suddenly get corrupted and lose access to the hard drives. If you're still intent on nuking the installation then try downloading Ultimate Boot CD from...
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