I had a similar situation once and it turned out to be a loose Northbridge heatsink. Somehow the mount for the heatsink had broken and it would not make good contact while it was standing up. I couldn't figure out how to fix the mount and I was too cheap to buy a new heatsink, so I just coated it with some Arctic Silver and viola... it worked.
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The taint. Conveniently located between the snack bar and the dumpster.
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