Yeah, it's probably the PSU caps like yakimushi said. They either turn on your PC for a second and then shut off, or they start making a constant noise when they're about to die. I'd try a different PSU in the PC if possible. That, or unplug EVERYTHING on your PC and just turn the PSU on connected to the motherboard and see if it hums.
Bad PSU's are usually caused by overloading them, so I'd look into that.
-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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