I'm running Dual 6800GTO in my XPS600.

 

Each card has dual DVI.

 

I have had problems getting DVI to my monitor, so I am running a dvi-vga adapter from the top card, through the vga cable into the monitor.

 

Does DVI need to be "enabled" in the computer, when I put the Monitor on "DVI" I get a blue screen.

 

I'm baffled.