Intermittent Shut Down

Hi All,

I have a problem with my computer.  It will intermittently just shut down without any error messages (even a BSOD).

I have tried the following:
1.  Replaced the PSU twice (just in case)
2.  I have run the MEM TEST for over 48 hours
3.  Have run 3D Mark
4.  Check the fans for dust etc

I have run out of solutions?

Cheers,
Kevin...*

^^^^ while you are there also uncheck the 'automatically restart' option under system failure.

Are you sure your computer isn't overheating?  
Download  Everest Home Edition to monitor temperatures:

http://www.snapfiles.com/get/everest.html