I recently installed a new graphics card (see specs)and two new case fans, after a few minutes(or a few seconds) my computer will turn off completely as if I had turned off the power supply. I was using a 520W PSU when this first occured, I decided that may be the problem, so I installed a Thermaltake 600W PSU. Alas, no change. I checked the thermal paste on my cpu cooler, it was fine. I tried manually setting the voltages in my BIOS to default, no change. I managed to get it to the desktop a couple of times and looked at SpeedFan to see if anything was overheating, but that was also a dead end. Usually, the sooner it powers off, the shorter time it will stay on for the next boot so it's pretty tough to work with. I haven't been able to get it to stay on long enough to run memtest or any other diagnostic tools(Who Crashed?, action center, event viewer, etc) I'm sure I was grounded during the upgrade. I have the latest catalyst control center for my new card and the latest driver for my motherboard installed. Any advice?
CPU: AMD Phenom II X6 1090T
Mobo: ASUS M4A78T-E
GPU: XFX Double D Black Edition Radeon 7700 Ghz Edition 1GB(was Sapphire Radeon 4650)
PSU: Thermaltake TR2 TR-600 600W(was cheap 520W)
RAM: 2x2GB DDR3 1066, 1x4GB DDR 1066
HDD: 1TB WD Caviar Black 7200 rpm
CPU cooler: Corsair Hydro Series H60
OS: Windows 7 Ultimate 64-Bit