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Computer Starts for 1/2 second and stops

My computer starts for half a second (CPU and case fans start spinning) and then stop. I have removed all connections and extracted the motherboard with the same results with solely the CPU, CPU fan, and memory. I used a second power supply, same problem. I purchased a new motherboard, same problem. I removed/switched the memory, same problem. I started without the CPU fan plugged in, same problem. I removed the CMOS battery for an evening, same problem. The only common denominator is the CPU. Is the CPU a possible culprit.

Motherboard: ASUS P5Q-E and P5G41-M LE/CSM
CPU: Core 2 Quad
Memory: DDR2 1066
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  1. Best answer
    Are you using on-board video? Or a video card? The reason I ask is I had a bad video card, once, that wouldn't allow the PC to start. I replaced it and it worked.
  2. Sounds like the CPU could be overheating. Did you put the heatsink on right, thermal compound and all?
  3. Best answer selected by mousemonkey.
  4. This topic has been closed by Mousemonkey
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