Everything is running fine on my desktop and on 2D browsing. 2D games and 3D fighting games (SF4, MK) are working fine. My problem is on most 3D games such as dota, SC2, smite, bl2, portal2, ac4, etc, where I play for a couple of minutes and then my monitor loses signal and doesn't display anything on the screen again until I restart my PC. I tried plugging in my hdmi again, but that didn't work. My computer is still on when this problem occurs so my pc didn't overheat or shut off. I have heard some people running an 280x on a 500w psu, so I don't know if my psu is the problem. I have a 600w cooler master psu. I assume it is something to do with the 280x drivers. I tried uninstalling and reinstalling the drivers from the amd site, but no luck unless I did something wrong. If someone can help that would be great!