Computer just powers down? PSU?

Update: Tried using the other 6pin connection (on the PSU) and this time the Furmark burn in test got over 2minutes in (long enough for the GPU to hit 90degrees and fan speed up) before powering down. Still the same end result though, so not sure this is relevant.
 
Ok so installed my new PSU (second hand SuperFlower 1000W Leadex Platinum from MM) and Furmark burn-in ran perfectly. So conclusion definitely my old PSU not hacking it!

Side note: Very impressive PSU. Dead silent, the cables are really nicely done and the lighting to the connectors is a very nice touch!

Thanks all for their help.
 
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