I am running a show and have a computer in front of me and the second display is appearing on a large screen on stage where I cannot see it. When I click on a folder on the desktop it opens the window on the second screen instead of on the one on my computer. When I Mirror Displays it appears again on the computer, but when I turn it off (it has to be turned off when I run the show) the window opens in the second screen. I have restarted, reset the PRAM, don't know how to get the window to appear on the primary screen... any ideas? Thanks for any help.