if it is powering down and up on its own, it isn't a software problem (or at least very slim chance). Even if the PS is rated at 500W, doesn't mean it is supplying everything your system requires. If you had a problem with a 480 not being enough, 20 additional watts is negligible. I would check the power requirements for your video card, it should state what watt/amps it needs on the lines it uses (you have 3.3v, 5v, and 12v lines within a power supply). Your power supply only needs to not supply enough on one of those lines to be insufficient.
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