At the drive selection screen, choose “Macintosh HD” or whatever the name of your hard drive is, this is the drive where macOS Sierra will be reinstalled to, then click on “Continue” or “Unlock” if you use FileVault.Click “Continue” and walk through the setup screen.At the “macOS Utilities” screen choose “Reinstall macOS”.Reboot the Mac and hold down COMMAND + R keys concurrently right after you hear the boot sound, this will boot the Mac into Recovery Mode.You can reinstall macOS Sierra or macOS High Sierra by doing the following: How to Reinstall macOS Sierra / macOS High Sierra Do not skip a backup, backing up with Time Machine is easy and every Mac user should perform regular backups with the service. Though the intention is to only reinstall macOS system software and not impact anything else, things can still go wrong. You should back up your Mac before beginning this process.
A clean install erases everything, a reinstall does not.
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