I have a Gateway 835GM with 1024mb of memory, Pentium D 820, and a 7800GT OC. Just recently, I have been having problems with the screen glitching out while playing any kind of game. It's usually fine just cruising the internet and watching videos, but as soon as I start up any video game I am lucky if I can play for 2 minutes before I have to restart. This is what I have tried and checked in my diagnosis: - Monitored temperature to ensure that it was not overheating, it didnt get above 75 or 80 degrees fahrenheit. Just to make sure, I re-seated the card and cleaned the heatsink with compressed air. - Underclocked both the core clock and memory frequencies to 75%, 50%, and 25% power and I was still crashing. What should I do? I really need to get this computer running.