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The first thing I'd check is the power supply. Power supplies are junky like that. When they go bad, they can cause intermittent problems like this one. You could use a voltmeter to check for continuity in the wires, but check EVERYTHING in the power supply. (including the molex connectors) Beware: This won't find voltage spikes or sags if that's the problem. A better option would be to borrow a friends power supply or go buy one. If the problem doesn't dissappear, then I am out of my league.
Hope it helps
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