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Sounds like Power Supply to me. I've built quite a few machines, and most problems of this nature usually lead back to the PSu. How many watts is it? Are you trying to run a bunch of extra components and a big 8800gtx on a small PSu? remember that those cards need 2 dedicated 12v rails with nothing else sharing, so your psu should have at least 4x12v rails.
The guy that taught me how to build stressed that above all else, never, ever skimp on power supply.
Also, 60c is pretty hot for idle temps. Mine never gets above 40 under full load.
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