What is wrong with my graphic card?

I had a new computer built a few days ago. My graphic card started acting up yesterday. It use to work before, boots up alright. But now, every time I try to boot the computer up, the system restarts, and the graphic card doesn't boot on the second computer start.

SPECS:

CPU: Intel i7 930

MoBo: ASUS P6T

PSU: 650w

Graphic Card: ASUS EAH 4650 (ATI Radeon HD 4650) (Low Profile, doesn't have power connector.)

The card still gets warm during the first bootup, so the electricity is going through, but not the second time it starts. Is it because the graphic card is incompatible, fried, or just not enough electricity since it doesn't have it's own slot for power? It should not a problem with the PSU or the Mobo. I've tried using the jumper on my mobo to erase the CMOS settings, but no luck.

P.S. The mobo doesn't have a integrated graphic solution...

Any help?

P.P.S. It's a new home-built computer. I didn't even put a operating system in yet! Without the graphic card, I can't do anything. So do not tell me that I need to change my operating system or remove my old graphic card! Please!