Upgraded MacBook Pro screen now blank

I Was upgrading to sierra. It downloaded. I last saw screen with apple in middle & progress of download. I came back later & screen was blank. How to restore?

MacBook Pro with Retina display, OS X El Capitan (10.11.6), Upgrading to sierra screen blank

Posted on Apr 4, 2017 9:00 PM

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Upgraded MacBook Pro screen now blank

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