I have a monitor that has been used for a year and suddenly I come back from Christmas Break and the display is not full screen. My presentation is set up to show at 1280x1024. The video card is set to display at the same resolution. Yet, the display is square and using just part of the monitor screen area. (The TV max resolution is 1920x1080, but as I said, the display usually shows full screen.) Any ideas? Other monitors are fine.