So I just rebuilt my pc and its been working fine for about 2-3 days now, I leave my room for a few minutes come back and my screen is black and nothing will bring it back up, pc is still on. And red leds are on under both GPU's. It wont turn off so I unplug I plug it back in and it works this has happened 2 times now. My cards argent dead because im using them now right? and they didn't overhead because I wasn't doing anything. Im thinking its a bad connection or my PSU isn't powerful enough.