Quote Originally Posted by cobra_kai View Post
It's a 1200W power supply from a good company, I doubt that it is a problem with the PS
I didn't even see he had a 1200w, still doesn't mean his 12v rail can't be borked though.
Although it's highly doubtful, I would go with a reinstall of windows.
Just make a ghost of his OS in the state it is now, format and reinstall.
If it isn't working, he can always put back the image and try to figure out what really the problem is.