Just bought and installed a GS600 PSU into a Gateway FX4710-UB003A. Then installed GE Force gtx 560 ti (new) and tried to power up....nothing. No case lights, not even blue light on PSU. Reinstalled stock 400W PSU and GE Force 9800 and system working fine. I could be missing something but I'm thinking this is a DOA Corsair PSU? If I had incorrectly connected ANY of the power cables (mobo or peripheral) from the Corsair would this PSU be smart enough to prevent power up? If so I my try again....help....