This is a last resort measure if your Mac is just refusing to work properly. It does not delete any of your data, it simply downloads and re-installs the macOS components without changing your settings or files.
- Intel Macs: Restart the Mac and immediately hold down cmd-R
Silicon M1 Macs: Restart by holding down the on/off switch for a few seconds and select Options) - You may need to connect it to wifi or ethernet!!!
- You should see the recovery screen (below)
- Select Reinstall macOS and press Continue
- This will take around 30 minutes.
Big Sur and later versions of macOS
Catalina and earlier versions of macOS
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