Just wondering if anyone could help me figure this out. I have my 40" flat screen plugged into my iMac via VGA cable to mirror the image. I'm just trying to have the imac display sleep while I play a movie full screen through the external TV. I've tried two different ways but both have failed. 1-I set up a hot corner in the imac to sleep display but this results in both the display and the TV sleeping. 2-I just set the power settings to sleep after 1 minute. This works but then If a movie is playing the computer won't go to sleep. Any other way of doing this? any help would be great, thanks!