After moding to 9800xt from 9800 Pro, it worked fine for a month or so, then produced no video output, and I doubt it even booted. After trying a number of different things, it just seemed to start working (I thought it was because I tried a different power supply connection). Now, it doesn't work again. I used the tutorial on ARP to mod it <Radeon 9800 Pro To Radeon 9800XT Mod Guide Rev. 6.0!>. I have the 8x32MD DDR version with a VGA Silencer for cooling. The fan runs. So far I have tried -only connecting the motherboard and videocard to the power supply (400v) -replacing the power suply (350v) -all the different connectors to the power supply My 9200SE works fine on this system. One night I played Age of Empires, I woke up in the morning and the computer wouldn't boot. I hope this is a known bug.