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My guess is that it's the motherboard. I've seen this symptom personally several times, and as far as I remember, it's because of the motherboard, not power supply.
However, the motherboard could be so finicky that another power supply MIGHT make it work temporarily, but after awhile it'll probably crap out again. Hell, even replacing the power cord temporarily fixed a machine that had this problem for me, but ultimately the bottom line was it was the motherboard that was the problem.
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