How to switch off my main screen (Imac 24") to use an external proyector?

Please Help!
How to switch off my main screen (Imac 24") to use an external proyector?
It's not comfortable when you want to see a nice movie!
Thanks
Jack

As I already said in my first reply post, you cannot turn off the iMac's display. The best you can do is display black, which many applications that have a +full screen+ mode will do, if the full screen mode is on the other display.
Alternately, you can move the menu bar (along with Dock and disk icons) from the iMac's screen to the second display. This is done in System Preferences Displays pane Arrangement tab, by dragging the white bar in the diagram from one screen to the other. Once the menu bar and other features are on the second display, the only thing showing on the iMac's display should be the Desktop background. If you pick a Desktop background that is all black, your iMac's display will be showing a black screen (although it will still not be turned off).

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How to switch off my main screen (Imac 24") to use an external proyector?

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