I just wanna note since it is related (note, I DO think the psu is just plain dead in this case) that I have found in my personal experance that if a computer spins up for a split second (leds, fans, etc, ) then turn back off, then something might be shorted, either theres a loose wire crossing or grounding itself somewhere.
I realise that that doenèt help the OP most likely, but I just wanted to share my experance with a few symptoms people posted earlier in the thread of similar problems :)
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