Our Main PC is a Dell XPS 400. About 6 months ago I purchased a used video card from ebay (bad idea i believe in hindsight) After installing the card and drivers, It seemed like the performance was improved, but i noticed a few "pixels" were not looking right. after a little internet research, I decided the card was probably on its last legs. Today, while my wife was using the pc - the screen went totaly dark on her. When she told me about it, i checked it out, and the screeen was flashing in and out. Some of the windows that had been closed were still stuck there (but not really there anymore). I was able to get the computer logged off, shut down and restart. Everything was working fine. BUT - after a while (10 min?) the same problems - screen going black, and then flashing in and out when using the mouse. Just for the sake of giving you the info (don't laugh okay?) - the computer was purchased new with an ATI Radeon x300 SE 128mb, and my "new" card is a BFG 7900 GTX OC 512mb. What do you think? is the Video Card Shelled out? Or do you believe there may be another problem? Thanks.