I bought a new video card for my PC. It was an HIS ATI Radeon X1650 Pro 512mb DDR2 AGP. Well, I installed it and all the updates. Well I went to work that evening and when I came home the screen was black. The computer was also locked up. I re-booted and thought nothing more of it. I went to work that evening and when I came home the screen was black again. I re-booted again and started looking at what I could do to fix the problem. I got a system optimizer and hoped it would do the trick. No luck, while right in the middle of playing my game the system locked up again. Well I guess my real question would be that my RAM is DDR and the video card is DDR2. Will this cause a conflict?