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I currently have a PCI-Express video card which supports my dual monitor setup with 2 outputs. I want to add a third monitor via a PCI slot, which I already have a video card for. When I plug the video card into the PCI slot, it disables the PCI-E card. I can hear the sounds as Windows boots up, but get no video on any of the 3 monitors. When I unplug the PCI card, everything functions as normal.

Is this normal behavior? Is it specific to each different motherboard?

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I've been struggling with the same problem. It seems to depend on the bios. On my current machine (Lenovo IdeaCentre K), as soon as PCI-E card is added, the on-board card disappears without a trace (nothing can be seen in Device Manager). On some other machines, everything worked right away. I even tried installing an old PCI video card, and it did not work alongside the PCI-E (I can use either one or the other, but not both). – dbkk101 Aug 22 '09 at 8:56
That's my problem as well. I'm running a desktop, though. I did find an option in the BIOS, but it was already set to PCI-E. I added a 2nd PCI-E card, and was able to get the 3rd monitor running, but the color was all off. I'm thinking now I might have a bad card... – Mark Struzinski Sep 11 '09 at 13:33
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There might be an option in your BIOS to say which video card should be initalised first, although it's possible that went away when AGP died.

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