I recently purchased a Dell 435 MT with the i7-920 and 8 GBs of DDR3 1066Mhz RAM. I plan on using the system for gaming and after reading these forums and others I purchased an Antec Earthwatts 650w PSU and an XFX Radeon HD 4890. Last night I put all of the components together in the system and it fired right up. I was excited to install drivers and download games to get rolling, however seconds after starting the computer the fan on the 4890 kicked in and my screen went black. I rebooted and the screen blacked out even quicker than the first time. I sat back down and disassembled and then reassembled the tower, with the same result. The graphic card was warm to the touch even after only having it running for a few moments. Does anyone have any suggestions?