As far as I know, the Athlon64 mobos have a strange habit of turning on, then going off, and then turning on again. We've build quite a few in our computer store (not me personally, though), and I've seen it happen repeatedly. Probably a "feature". I have not seen the bios screen flash, though, so it's not quite what you described. It *might* be the harddisk, but it might also be this thing.
I have WD drives too, and I have no such problems here.
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