You need a video driver that supports the external video port. Go to the Dell site and download their latest driver and it will likely support that. If you installed the system with a default Windows it likely doesn't support dual monitors.

+++ Rick ---

>I have two monitors on the desktop unit at my office and love it. All that Desktop space. I have a laptop (dell latitude CPt) I carry back and forth and would like to have the multiple monitor functionality at home also.
>
>All the Docking stations for dells do not allow for multiple video cards. The laptop will only show on the external monitor and not expand the desktop.
>
>Anyone faced this and found a solution?
>
>Thanks
>
>Alan Wyne
>IS Manager
>Rollpak Corp