I have a Gateway GT5228 - it came with XP and i upgraded it to Vista some time ago. However, I have had to do multiple re-installs since.
About 2 years ago, I upgraded the video card by adding one to the PCI slot. Its a geForce Nvidia 7100 - And ever since I have had my monitor attached to this slot and not the original display port..
I added a 2nd monitor now to my Gateway and only 1 monitor works - the monitor that is plugged into the video card I installed.
Then, when i go into "Display Settings" it seems to ONLY recognize the "nVidia geForce" adapter and I can not get the other monitor to turn on..
(See attachment of image of my dispaly settings). I have also tried enabling and disabling the drivers in Device Manager. (However, I did NOT try uninstalling/reinstalling as I was afraid I wouldn't get a display at all..)
*Again, I have both monitors plugged in, but it seems the computer does or is NOT recognizing the original Monitor Display Port when I bought the computer and ONLY recognizing the Video Card I installed..
**Notice in the images attached - that both 1. and 2. (Generic PnP monitor and (Default Monitor)) are both trying to display on the GeForce 7100 - or so it seems)