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Open the case and blow a warm hair-drier around and see if that promotes the shut-down. If it does, allow the unit to cool, then restart. This time, try and be a bit more directive with the hot air and see if you can locate the heat-sensitive part. I have successfully used this technique to find faults in TV sets that start to act up after they have been running for a short time.
You could also try re-seating your various cards and the memory chips.
If it turns out to be a problem on the MOBO, what better excuse for a nice new PC, an i5 perhaps?
Robert
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