I HAVE A IBM THINKVISION LCD MONITOR AND HAVE A GREEN LINE IN THE MIDDLE OF THE SCREEN. HOW DO I REMOVE THIS?

Try the 'auto adjustment' feature of your monitor (see the monitor instructions for details).

Or try changing the resolution of your computer display (go to the Display Control Panel and click Settings).

Also wiggle the video cable or try a different cable.

If these don't help, probably your monitor is bad, so try a different monitor to make sure.