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Yesterday I was about to take the PSU out and send it back so had the computer on my desk with the case open. While it was running I nudged the main power connector to the Mobo - the one with the 24 pin plug on it- and the computer suddenly shut down and would not restart. I unplugged and replugged the 24 pin connector and it worked again. After an hour or so the computer shut down suddenly again. This time I had a careful look at the male sockets on the 24 pin connecor and a few looked a little 'splayed' to I closed them up with a pair of fine pliers. Everything now seems to work including the graphics performance and I have had no more sudden shutdowns in the last 12 hours.
Hopefully this has sorted the problem......
Presumably one or more of the contacts were not secure.
Only goes to show that computers are complicated beasts that can go wrong in many strange ways !
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