Don't post in 2 sections of the forums, instead ask a mod to move your thread

Welcome to the forums btw.
Anyway to the topic at hand, please try the following:
Go into the Nvidia Control panel (right click on the Desktop -> select Properties -> go to the Settings Tab -> click the Advanced button -> click on the tab that describes the Video Card you are using "Geforce FX5200" for example -> Now click "Start the NVIDIA Control Panel"
The alternative way of reaching this menu is to right click the desktop and there might be a option called "NVIDIA Control Panel" or something similar.
Once you've reached this control panel expand the Display tree, click on Setup multiple displays in that tree, NOW select "Only use one display (Single)"
Next there should be a drop down list entitled "Please select the display you would like to use", On this list pick the DIGITAL connector.
In my case I have two options on the list "L90D + D-SUB" & "L90D + DVI", DVI is the digital connector.
Hope this helps
EDIT: Here's a picture of how what I described (pictures make it so easy

)
http://img134.imageshack.us/img134/9052/exampleic0.jpg