I wonder if it was the actual insertion of the CPU and sink?
You said after you took it and added some thermal grease it works fine, maybe it was not in all the way and once the heatsink and fan started running it was enough to wiggle the cpu out of place and laying it back down on its side was just enough pressure to make contact for it to work.
That or the grounding issue would have been my two guesses.
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Spank you very much
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