No display

[MikeSchuyler]

I have a Dell Insprion 660 with intagrated graphics. I wanted to put in something a little better so i got an old 8800 gt and 550w psu. The problem is when i install the graphics card and connect to the monitor there is no display. The psu works fine because there were no problems w/o the graphics card. So i took a look at the bios and i couldnt find a way to turn intagrated graphics off. I dont know if im missing something or if there could be another problem. plus, i know the graphics card works because its off of another computer that i used.

 

[Deders]

Are there any options for selecting initial display anywhere in the bios?

 

[Burpo]

Is the 8800 gt PCI-E power cable hooked up?