PLEASE HELP! Display not filling monitor on startup

I purchased a BFG GeForce 6200OC a month ago. Everything worked great until a few days ago. Now, when I start the computer and it gets to the desktop, there is a gap of about an inch of black space on the right of the screen. If I hit the auto adjust button on the monitor it fills the gap, but I do not want to do this every time. I have re-installed the video driver and changed monitors, but that did not work. What can I do?

Odd, yes. Just fishing here... suggest manually adjusting the horizontal and see if it sticks on the next boot.