Could be a grounding issue. Remove the mother board from the case, and place on a piece of cardboard. Plug in the power supply, memory, monitor and power switch if it will reach (if not then you will need to short the jumper were the power switch plugs in with a small screw driver). Once set up, power on the mother board, you should get a no hard drive error, since we did not plug it in. If this does work, you will need to go the hardware store and pick up some rubber or paper washer to place between the mother board and the case.
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