Sorry its a bit long winded, but here is my problem.
The PSU MB and Graphics card are all new. The system works fine for all process, EXCEPT when I start to play games. After about 5 - 10 minutes the whole system just shuts down as if the power lead has been pulled out the back. I cannot restart the system for about 45 minutes unless I do pull the power lead out of the back for a few seconds and then re connect it. I have run various programs maxing out the cpu but it does not cause any problems. It only happens when I am playing games. Is it a problem with the graphics card or is it the psu. I have all the latest drivers but I am at my wits end. Any help/suggestions would be gratefully accepted.

Cheers