Hey everyone, I am a noobie here on MG, and I've done some research on this issue on the forums here but I still want to get some of your opinions on the subject. So last night I received the final peice of my gaming PC puzzle came in and I installed it and everything worked wonderfully. Here are my PC specs: i7-3770K 3.5ghz CoolerMaster Hyper 212 Evo Gaming Cooling Fan Asus P8Z77-V LX Intel Z77 Chipset DDR3 ATX Mainboard NVIDIA GeForce GTX 680 2GB 16gb Corsair Vengenance Ram (4x4gb) 120gb SSD Hard Drive 2 1tb Hard Drives (Raid 0) 800 Watt Power Supply 5 case fans (2 top, two at the Hard drives, one below graphics card) I think that's everything important, but feel free to throw me a question if I forgot. So here is the series of events that happend to me last night. Uninstalled the drivers for my GTX550ti, uninstalled the GTX550ti physically, installed the GTX 680 physically, then installed the GTX 680 drivers. Everything at this point is running great, I start up Battlefield 3, put the graphics on ULTRA and I'm getting around 100-120 fps. So I go play a match and then all of a sudden my game crashes and I have to do a task manager force quit to actually get the game to stop running on windows. I restart the game and lower the graphics to medium and I'm getting around 160-200 fps. Play a match and the PC just shuts off . I did not measure the temps, but I wish I had to give you an idea of what they were running at. This series of events happens 2 or 3 more times and on the final time the PC will not boot back up. It will not even try to power up. I am thinking my PSU took a dirt nap, but I am not positive. The motherboard led light glows when the power switch in the back is on, but that's it. When I press the power button to power the computer on, one light on the case flashes, but that is it and nothing happens. Again I can not turn the PC on to measure any temps so yeah....I am thinking my PSU wasn't enough for my monsterous PC build and just folded under the preasure, but I could be wrong. Hope you guys can shed some light on this situation for me.