computer shutdown by itself

ok i never had solve this problem :(. When i even boot the computer, it sometimes shut down randomly and have tried with the cover off. Seems like it the power supply. But anybody else agree?
 
It could be the PSU, all it takes is money and 10 minutes to find out.

I have had PSU's just go bad from one boot to the next.

One other thing. I see that the PSU you are using is a modular design. Try adding a cable to the psu and running it just to the video card. (if you have not already done that) Sometimes running more than one thing on a cable will cause voltage problems.
 
If you have another PS from another system, or an extra one, try swapping it to see if the problem goes away!
 
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