If you have a PC: Go to the Control Panel - select display - select settings - click on advanced settings - locate your graphics card from the menu and click on the box located there - this should bring up a small box in the upper left hand corner and I believe you are looking for "display output" or "output settings" (I'm trying to do this from memory as I'm working from a Mac right now) and you should be able to select dual-monitor mode. You should be good to go.

