Got a replacement 9800 pro from ATI, put it in my son's computer. It seemed to work fine, but I then checked the device manager, and it showed the card as "Unknown" device. That is, it wasn't recognized as a display adapter. The card in before that was a Nvidia 5500 oc. I uninstalled it and used DP pro. Spend the entire day installing and uninstalling drivers, including the Nvidia Nforce 2 drivers for the motherboard. Is it a bad card?