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HP Media Center M7000 desktop powers down after 8 seconds.

\015 I have a HP Media Center M7000 desktop. I power it on and after about 8 seconds it powers off. I removed all cards, disconnected the CPU fan, removed memory simms to no avail. I disconnected the hard drive and it made no difference. I removed the P7 (12 volt) connector and it stays up (not doing much of course) and I measured the voltage on the P7 and it's 11.83 on both so that's within spec. Any ideas what to do next other than replace the motherboard? What could be shorting out the motherboard so the whole thing powers down?\015

Answers :

Before changing the motherboard just try to connect every thing without the case and then reset the bois then if the problem is still then it is the motherboard but befor you do this just it ia a crazy thing but will make all the terminals ground put the motherboard on the wall and make sure all the terminals is connected to the wall
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