So Thursday morning my lil brother decided to turn off the fans on my CPU case ( have side pannels which control the fan speeds). I get home from school play bf3 the tf2 then homework then tf2 then more homework. Now it's night time and I was Gona battlefield 3. As soon as I launch bf3 my monitors says going to sleep mode. Fk I instantly knew its a gpu problem. I can hear gun shots and *** but when I turn on my monitor it doesn't find signal (VGA dvi or hdmi) and I know it's pluged in correctly. Did I kill my gpu? I have a zodiac gtx 670. Also how do I at least use the VGA built into my mobo so I can at least do my home work. Don't ignore I need you guys!!!!