David DeRolph 2007-06-02 02:55
Are both cards ATI or nVidia? Per http://www.microsoft.com/whdc/device/display/multimonVista.mspx, multiple video cards must use the same graphics driver to work in Vista.
I'm not using Vista but I do have an AGP and a PCI video card installed in my Win XP system. The APG is a nVidia FX5200; the PCI, nVidia GeForce4 MX440. They use the same driver. Such a situation is what you need with Vista.
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