I think it's a driver issue. I recently switched over to ATI, my set-up before were two 8800GT SLI'd and i'm having a issue starting up my computer. When I turn it on nothing displays on the monitor but when I reseat the card on the other PCI-e slot then it would work. I used to think it was a power issue where the card might have been sucking too much juice for my PSU to handle but I highly doubt that is the issue now. Anyone can recommend a good driver cleaning software I can use to clean the PC?