Help needed - vga led comes on

I'm building a new computer, and finally got it to boot up last night. The Win7 install goes fine, but then when it went to reboot, the vga led stayed on. I tried reseating the card (8800 GT, which worked fine in my old computer). I was out of ideas and it was late, so I went to bed. This morning I tried again. This time it worked fine and I begin the install of Win7 over again. When it goes to reboot the same thing happens again.

When I pulled it from my old computer, the fan seemed pretty weak, so I blew out the dust before building the system. Now the fan kinda varies quite a bit. Starts off really fast and then slows down (when it actually boots).

Would fan issues cause cause the VGA LED to come on? What else would make it come on? I doubt its heat issues since everything just started up and the card feels cool to the touch. Plus its just windows running and the bootup sequence. I do have the power cable connected to the card.

Luckily I bought another 8800 GT, which I was planning on running SLI, so this will help me with my investigation. It won't arrive till next week though. The only thing I haven't tried is running in a different PCIE slot.

I have a Asus P7P55 Pro w/ an i5-750 stock speed.

Thanks