I agree with Neo about the PSU. I'd try a different PSU first, then try a different motherboard. I'm a freak, so after that I'd try every single other piece of hardware in the PC until I find what's causing it. It sounds to me like you have a PSU or motherboard problem though.
-Lasereth
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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