I've been working on this for days. Im running a Dell Precision 490, with 4 gb ram and a nVidia Quadro FX 3450/4000 PCIe Graphics card, and Windows 7 x64. I bought a new EVGA GeForce 8400 GS (PCI) and tried to install it seeing as I wanted a 3 monitor desktop. When I install it, it is not recognized at all by the system. I updated the BIOS and installed drivers but they did nothing. In the BIOS the Quadro is recognized as a VGA device in the PCIe slot, but the PCI card is recognized as a PCI Bridge. I tried another PCI graphics card and it was recognized as a VGA as well and showed up in the device manager, but its quite outdated and so windows 7 could not find a driver and nor could I.
I need help with the 8400 GS please!!