Someone Somewhere said:
Unfortunately, the PSU is the most likely culprit. Can you borrow one from another machine or a friend?
If you are talking about the PSU being faulty then that is possibly the case, and could be the issue there
If you are saying that its not enough Wattage, this is what I have to say :
WHAT?!?!? That PSU is fantastic! You could run two GTX 680's with that PSU! Are you crazy! wasmdkasdm;asd