Step 4: Reinstall a clean Mac operating system. Restart your Mac. While the startup disc is waking up, hold down the Command+R keys simultaneously. Click on Reinstall macOS (or Reinstall OS X where applicable) to reinstall the operating system that came with your Mac. Click on Continue. Restore From Time Machine Backup: Restore your Mac from a Time Machine backup. Reinstall macOS: Download and reinstall the Mac operating system. Get Help Online: Use Safari to browse the web and find help for your Mac. Links to Apple's support website.
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macOS Recovery is part of the built-in recovery system of your Mac. You can start up from macOS Recovery and use its utilities to recover from certain software issues or take other actions on your Mac.
How Long Does Activation Take For Mac Os X Reinstall MailHow to start up from macOS Recovery
If you can't start up from macOS Recovery
If your Mac can't start up from its built-in macOS Recovery system, it might try to start up from macOS Recovery over the Internet. When that happens, you see a spinning globe instead of an Apple logo during startup:
To manually start up from Internet Recovery, press and hold either of these key combinations at startup:
If startup from Internet Recovery is unsuccessful, you see a globe with an alert symbol (exclamation mark):
In that case, try these solutions:
How Long Does Activation Take For Mac Os X Reinstall Error
If you still need help, please contact Apple Support.
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December 2020
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