Yeah, you might have to turn to the hardware for the problem. Every monitor i've ever seen has buttons on the front or the side that relates to horizontal size, vertical size, horiz. position and vert. position. It also has options dealing with geometry, rotation, color temperature, and misc other properties.
If you have the black border, my suggestion is to stretch the horizontal and vertical sizes. Make the screen as large as you can while still keeping every part of it visible. You may also have to center the image.
Or, some monitors have an "Auto" feature that'll do all the tedious operations for you. I am but so luckY