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Is there any way to set a MacBook Pro to not sleep when you close the lid?

I have a Macbook Pro (early 2011) with Mountain Lion installed.

Is there a way to prevent my Mac from going to sleep even on lid close?

marked as duplicate by Lri, nohillside, Mark, bassplayer7, bmike Jan 6 '13 at 1:29

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If you have an external monitor plugged in, it will happen automatically.

Otherwise, you can use InsomniaX.

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