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How to reinstall Mac Sierra X OS

I try to reinstall Sierra OS but it doesn’t seem to be working!

Posted on Aug 30, 2018 7:07 PM

Best reply

Eric Root

Level 10

684,045 points

Posted on Aug 30, 2018 7:29 PM

Do a backup, preferable 2 separate ones on 2 drives. Boot to the Recovery Volume (command - R on a restart). Run Disk Utility and select First Aid. Then re-install the OS.

OS X Recovery

OS X Recovery (2)

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How to reinstall Mac Sierra X OS

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