Computer shutting down automatically

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Okay, I am at wits end with this problem. I replaced the power supply with a larger one (Corsair 650W), replaced case with more fans, reseated CPU and added some more heat sink compound (Cleaned off old stuff). Could it be the video card is overheating where it is shutting the computer down? I have an 8800 GTS, which does got extremely hot (Where I have to put a house fan on the case?) Should I replace that graphics card for this motherboard combo that has on-board video on it?
 
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