MacBook Pro model A1278 crashed after update

  Jujubee831 15:50 21 Dec 2017
Locked

Ok so I got a notification that I needed to do an update but it was taking forever so I left my computer and went to bed. Next day my computer doesn’t work and is saying something about a drive not being mounted? I don’t know what to do and am clueless when it comes to this part of computers. Please help!

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