REINSTALLING macOS
Apr 27, 2017
3 minutes
ONCE YOUhave backed up your data, you can eliminate any corrupted files by erasing the Mac’s hard drive and reinstalling macOS.
This is done in macOS Recovery, a separate area of your hard drive which contains tools to diagnose and fix problems, such as the system running slowly or failing to start up.
Access the Recovery system by powering on your Mac and holding down c+R. With luck you’ll see a welcome screen in various languages and an arrow button you can click to continue.
If for any reason Recovery fails to load, restart your
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