I downloaded El Capitan and now my MacBook Pro boots to a grey screen?

Why does my screen showgrey and won't boot up after I downloaded El Capitan?

MacBook Pro (15-inch 2.53 GHz), iOS 9.2.1

Posted on Jan 22, 2016 9:29 AM

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I downloaded El Capitan and now my MacBook Pro boots to a grey screen?

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