We had power flicker on and off the other day. When I turned the computer back on only the fans were runnning and no "beep" from cpu. I inspected the MB and CPU but look just fine and have no burning smells. Power supply possibly? I had a 650W in it. I put another one in(450) it but it will kick on for a split second and turn back off. even with only the MB power connector connected.
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