For Windows 7, and this is similar for other Windows products, go to control panel > display > change display settings. There will be one or two virtual screens in the box. Sometimes, if you change one monitor to the primary display by clicking on them, it will hit the right monitor. I would try the above recommendation first. You can hold down the FN button and tap F4 to scan selections (if there is more than one available). If it isn't F4, the button will have what looks like two boxes, one with a white square in it, and one without, separated by a vertical line.