I just went through the same exact problem. Tried different HDDs, 3 different OSs (Win98 Win2K WinXP), and even swapped the power supply. After moving everything to another MB all was fine. It ended up being the mother board. It started by freezing up at random times, then evetually just rebooting like you hit the reset button. It mostly would restart at the Windows 'splash' screen. I even tried turning on the "Blue Screen", but never saw one, and the event viewer showed nothing.
The old MB was an Abit socket 370 about a year old. Just got a Soyo to replace it.
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