So I have a 24' Samsung monitor plugged into my computer A. It is connect with a VGA cable with a DVI adapter for the video card. I needed to unplug it to connect computer B and see if it works. When I was done, I hooked up my computer A back and the resolution changed from 1920x1080 to 1600x1200 and it won't let me set it up higher. I tried to reinstall the drivers, but it doesn't seem to help. The monitor is fine, I can set 1080 on different computers. Does anyone know what seems to be the problem?