This is a HP Media Center PC m7000. I hit the power button and it starts up but shuts down after 8 seconds. I tried a different power supply but it did the same thing. I removed the motherboard and disconnected all cables except for the P1, the power switch connector and the 12V supply to the motherboard. When the 12V was plugged in and I applied power, the CPU fan barely moves and the supply shuts down after 8 seconds. I removed the CPU from the socket and powered the MB up with the 12V applied and the CPU fan runs quickly and the unit stays up. So now I either have a bad socket for the CPU or a bad CPU. Any way to determine if I have a bad CPU chip before buying a new one?