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?You have to turn it on, Control Panel---DisplayWindows doesn't see it unless it's the only video card. I can't turn it on from there.http://support.microsoft.com/kb/943104I have already tried all the methods shown there.Quote from: Fleexy on July 29, 2011, 04:59:17 PM

1. My computer has several video card slots.
2. One has a different connecter than all the rest.