I am currently running WinXP Professional on my computer. I recently tried to add another monitor to my setup. My computer has several video card slots. One has a different connecter than all the rest. An NVIDIA Quadro2 Pro card occupies this slot. When I inserted a new card into one of the other slots (and connected the new monitor properly), Windows boots and works fine. However, the new card is ignored by Windows. When I looked in Device Manager at the new card, it said "The device could not start (Code 10)". I tried the same with a different new video card and the same thing happened. When I removed my standard card and only left the new one, Windows booted fine, sending video data to the new card and monitor. But when I put the old one in with it, the new card fails to start. Help?