sorry friends, I know issues like this have been brought up in the past but I don't know what to do. History: I recently built (not without difficulty and help from friends) a new computer. I had planned on it being used just for school but, when assembled and running, decided I'd like to game a bit as well. My initial specs were: Win 7 RTM GA-EP45-UD3P v1.6 mobo Intel Core2Duo E4800 2x2GB DDR2 PC 8500 ram 1x ATI 4670 GPU Antec Sonata Designer case with 500w psu this setup worked fine When I decided I wanted to get a bit more gaming power I went out and purchased a second ATI 4670... I soon learned about CrossfireX and trying to get my 2 cards to work became an unsuccessful project for the next few days. Although a dual GPU system was never realized, I booted and ran Windows without issue. My next step was to return both ATI 4670's and leave frys with a BFG's GeForce GTX 285 OC and an Antec 850W True Power Quattro PSU I removed EVERYTHING from the Antec case, used a dremmel tool to cut into the HDD housing rack (space for the new GeForce was too short by an 2cm), installed the new PSU along with the remaining component's from above. What I did not do was uninstall the drivers and software for my ATI's before returning them. I thought this might be an issues but figured I could correct it without too much trouble. My computer has not posted since, at least I don't think so. The fans start spinning, blank screen, and after 30s to 1min powers off and starts cycling on and off... I've tried my old PSU, I've tried a very old graphics (some PCIE 1.0) card from a different computer, I've tried no graphics card, I tried disconnecting my HDD and other peripherals... Don't know what to do. I'm learning as I go and don't even know how to trouble shoot this further. Thanks for any advice in advance.