I have a Mitsubishi Plus 91 19" monitor and the bottom left and right corners are slightly tinted. The left corner is a greenish color along the edge, and the right corner is a bluish color. When I change the horizontal size, the colors seem to move with the desktop, staying at the edge of the picture. I've changed background patters, but that doesn't seem to do anything. The left corner has been like this for a little while now, but I just noticed the right side today. I've had the monitor for about two months now. Any suggestions on what may be causing this, and how to fix it?