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Question: Not booting after update

Hi there, my brother had me look has his MacBook Air, bought it this summer and I’m pretty sure it has OS Sierra. He performed and system update, computer clean doesn’t really have anything on it, upon restart it’s black screen, Apple logo, gets to full then glitch and restarts and continues to do that, tried holding shift key and command r etc nothing happens. Any help greatly appreciated

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Nov 16, 2017 11:43 AM in response to Nathan Gogol In response to Nathan Gogol

Hello Nathan,

Thank you for using Apple Support Communities.

I see that your brothers MacBook Air is not starting up. There could be a few different things causing this, to that end, I would recommend starting with this support article to sort out what is going on:

If your Mac won‘t turn on

Best regards.

Nov 16, 2017 11:43 AM

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Question: Not booting after update