I have a second monitor connnected to my iMac (20" C2D) Is there an easy way to turn off the second monitor so the iMac does not detect it? I turn the 2nd screen off when I'm not using it, but obviously, if it is still connected to iMac it is detected. This can cause the mouse and items to get "lost" on the second screen and it also draws on the VRAM. I would like to disable the second monitor without having to disconnect it and reconnect it each time I want to use it. Is there an easy way to do this?