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> **Possible Duplicate:**  
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> [Is it possible to put the display to sleep without putting the whole computer to sleep?](https://apple.stackexchange.com/questions/27279/is-it-possible-to-put-the-display-to-sleep-without-putting-the-whole-computer-to) 
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I have an iMac, and sometimes I want to play some music over night, without the bright display. The display will be turned off automatically several minutes later, but I would like a button that turns the display off instantly and keeps the music playing.

How can I do this?