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How to turn off MacBook Pro screen in two-headed mode

 
Sheriff
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Mac IntelliJ IDE Python VI Editor Java
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I'm new to Mac, and I have to say I really like how it handles two-headed displays. It makes it easy to specify where the external monitor is and slide things from screen to screen. It even somehow remembers the different configuration for my home and office setups, so when I'm at work it knows the external monitor is to the right, and at home to the left. However, sometimes I just want to have everything on my big screen, and let the MacBook screen stay dark. I know this is possible because it sometimes happens spontaneously when I wake the Mac up from sleep. How do I make it happen though?
 
ranger
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Mac IntelliJ IDE Spring
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Well in dual screen there is a mirror image option that will put it the same screen on both monitors.

Then just hit the power button on one of the monitors and now it shows on just one screen. JK on the last part

Mark
 
Greg Charles
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Hey, that made both screens go black! The problem might be I wasn't sure which JK you meant. JK Simmons of "Law and Order", "The Closer", and "Juno" fame ... or JK Rowling?
 
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