Shutting one screen down and activating an attached...

Using Vista, I am using a notebook but I want to change to a different monitor. I have the external monitor attached and was originally getting the mirrored images on the two screens. After playing around with it, the notebook screen is still active while the attached monitor now displays only the screen saver without any icons.

I went to the display settings but no matter what I do I can't change the notebook to be monitor #2 and the attached monitor as #1. My secondary monitor is a Samsung.