hi my monitor is a 17 inch compaq 7500 crt. It went from 17inches of veiwable display to like a 12-13inch. The monitor smushed the viewable size and you can see the black on the sides that took up the inches. I tried using the buttons on the monitor, that didn't work and used the display settings. Also, it will turn off occasionaly for no reason.Is my monitor going out or something?