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Q: How do I turn off the laptop display when using an external monitor ?

How do I turn off the laptop display when using an external monitor ?   Using a MBP 17" 2010 with a DELL S2340T

MacBook Pro (17-inch Mid 2010), OS X Yosemite (10.10.3)

Posted on Apr 25, 2015 12:01 PM

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Q: How do I turn off the laptop display when using an external monitor ?

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