I did a very stupid thing. I installed a PCI VisionTech X1300 on my ASUS P4P800-MX board with the intention of upgrading to Vista. I went into the ASUS BIOS and disabled the onboard video, so that I could get the X1300 card to work. After installing this card, I was getting messages that I needed to install a video driver. Since my X1300 video worked, I did not install the driver (stupid). I was told by ASUS that this board is not compatible with Vista. I am building a new computer and my plan is to keep my old computer and go back to using the onboard video. I would then switch the X1300 card out of my old computer and put it into the new computer that I am building with an ASUS P5K deluxe board. Well, as luck would have it, before I could switch, my video went blank. I cannot get my video to work with my X1300 card on my P4P800-MX board. I have tried to switch to my onboard video, but since I disabled the on board video, that will not work. I have taken the X1300 card out and reinstalled it and still no video. Can anyone tell me how to get my monitor to work with my P4P800-MX board?? Thank you.