I need some help here guys....i have a Infocus 4805 that I had hooked to my vga port out of my pc{worked fine} but want to keep my existing monitor hooked into that port...so thought I would hook projector into dvi port but can't seem to make second display monitor[projector] out of Dvi port work....Any suggestions as to what the problem might be?....appreciate any help you can offer.....oh video card is a Radon 9800.....