Ever since I installed my GTX 760, my computer has been shutting down by random it seems. The only time I've been able to replicate it shutting down is when I run a really demanding game like Planetside 2, or Splinter Cell Black List. The other time i was able to replicate it was when I was doing the windows computer test where it gives you a rating for your computer. Imagine just ripping out the power cord from your computer, that's what it's like. I already checked for virus, overheating, everything is all fine. Help?