Bought a video card for an HP desktop so I can run 2 monitors. On the desktop there is a vide card that has a vga port and a dvi port. I tried at first to plug in 2 monitors to this video card but only 1 ever shows up. Can this be done? So, on to the purchased card. I plugged it in and it has a dvi port on it plus an adapter for vga. First I plugged in vga to the current video card and used vga port on the new installed video card. When I reboot the new video card works fine but it must be overriding the other video card that came with the computer because only 1 monitor works, the one that I just plugged in. So I tried going directly into the dvi port of the new card and the dvi port of the existing card and the same thing happens, only the new card monitor will come on. Any ideas of where to start?