I recently built a new computer and after several hours spent getting it to actually work and run games, it suddenly turned off and now won't turn back on. The video card said it needed a 400W minimum psu and the one i got is 450W but I'm not completely ruling out psu failure. I tried unplugging the drives, video card, and fans just to see if it would actually turn on, but it still wouldn't. Anyone have any ideas?