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I have seen this problem occur with bad power supplies. I would check the voltage at the board when you start the computer; if your system powers down quickly than this might be difficult.

The problem might not be apparent until the system is shut down and restarted at a later time. The load on the PS is high during startup. And it is not abnormal for a bad PS to show normal voltage after warm up. The combination of the high demand and low voltage at startup can cause the MB to power off.

I would suggest swapping the PS with a new or known-working one to test this out.

Jim
 
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