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I have Retina Macbook Pro 15' connected to an external monitor. Is it possible to close the MBP's lid and still use the external monitor without entering sleep mode?

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Yes, it should work without any special extra configurations. You only need to have the macbook connected to an external display and also have an external keyboard (probably it also works without the external keyboard, but what will you do without it :p). If you have the lid closed and macbook is "sleeping", you can wake it up (by pressing any keyboard key) and start using it with the external display without requiring to open the lid.

Cheers!

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OK, I've just done that but the external monitor doesn't wake up. –  Anonymous Nov 7 '12 at 10:46
    
Does the external display work when you have the lid open? –  emgsilva Nov 7 '12 at 10:52
    
yes, it works perfectly when the lid is open. –  Anonymous Nov 7 '12 at 11:07
    
weird... here are some discussion on that topic: support.apple.com/kb/HT3131, it says you should have the macbook connected to the power and have the external keyboard/mouse connected. Take a look. –  emgsilva Nov 7 '12 at 11:11
    
Oh, it isn't connected to the power and the mouse is connected to the screen. ( actually I'd prefer that both the mouse and the keyboard to be connected to the usb ports in the monitor) –  Anonymous Nov 7 '12 at 11:12
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