A video card plugged into the AGP slot????
Have you tried enabling the onboard in the BIOS and removing the video card??
There are two different connectors, correct???
Whenver I turn my computer on with the vga adapter connected to the onboard gfx nothing shows on the screen. The button is yellow. When I connect it to my radeon 9600 pro card it comes on. I enabled the video in my bios and nothing happens.