MacBook Air starts after you download El Capitan.

Help, please... I can't reboot my computer after a recent update. This has happened once before, so I don't know if it has nothing to do with the download. I get the ringtone, the Apple logo and progress bar starts, but stops at half way through and the screen will Dim. The Genius Bar is reserved for Friday and I haven't the time for a walk in apart. someone?  Thank you!!

Try safe mode if your Mac does not end commissioning - Apple Support

Tags: Notebooks

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