I've had my gaming PC for about 6 months now. It's a custom built desktop that's running a Gigabyte AMD Radeon HD 7790 2gb graphics card and an Intel core i7 3770. My PC worked fine up until about three weeks ago. Whenever I try to play a graphically intensive game, the graphics card seems to stop working and my monitor loses signal. All of my drivers and BIOS are up to date, and I have cleaned the registry. I can play less intensive games like Minecraft and LoL on the lowest settings, but if I even try to load Battlefield 4 on low settings, my monitor will lose signal. I sent the graphics card in for repair, and they said that there was no problem with it. I was wondering what the cause of this problem could be. I haven't played BF4 in weeks !