I was doing some temp IT work for a summer, and one of my jobs was to reimage a computer for a new employee at a bank. I did everything properly, but the proper desktop image never would show up. I kept working on it for hours trying to get it to work, until I finally ran out of time and had to go home. The next morning, I came in and took a look at how the monitor was hooked up. There were both a VGA cable and a DVI cable going from the computer to the monitor. It turns out that the computer thought it had two monitors, and the monitor input was set for the number two spot. In the end, all I had to do was remove one of the cables and it was fine all along.