If an external display doesn‘t work with your MacBook Pro (Retina, 15-inch, Mid 2015) or MacBook Air (11-inch, Early 2015) running OS X El Capitan v10.11

After you install OS X El Capitan v10.11, you might find that your external display doesn't turn on when connected to your MacBook Pro (Retina, 15-inch, Mid 2015) or MacBook Air (11-inch, Early 2015).

You can resolve this issue by updating your Mac to OS X El Capitan v10.11.1.

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