Ya, PSU is too weak. That's a pair of 9800GT's you got in there. When I ran a couple of 9800GT's, they only worked with my Antec Earthwatts 500W or above. Using a cheap PSU at that wattage could kill your rig. Try a Corsair CX600W, that will last you forever. Good luck man. I'm not sure if the card is dead, just that you don't have enough power.
Heck, even a single 9800GT would not boot with a good 450W PSU in my case. They were just not designed for that kind of power draw.
Everything that irritates us about others can lead us to an understanding of ourselves. -- Carl Jung
eVGA X58 tri-SLI, i7 930 @ 3.8GHz., Corsair 6GB Dominator, Inno3D GTX470, eVGA260
ASUS P8P67 Pro, i7 2600K @4.60 GHz, 8GB RAM, eVGA GTX 460