CPUs are pretty sensitive to overheating.  THere has to be a solid connection between 
the heatsink and the CPU, and thermal grease is what does that.  After a period of 
time the grease hardens up and, especially after you remove the heatsink, you need 
to remove the old and reapply the new.  Its just something to try.  Like I said, 
sounds like a hardware issue, but a good test of that would be to let the memory 
tester I told you about run.. See if it is able to run for an extended period of 
time or not.  It will heat the CPU as good as any stress tester.

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