Sep 19, 2018

How to start Mac in Recovery Mode

Make sure the Mac is off. If it's not responsive because it's stuck on a grey, blue or white screen, just hold down the Mac's power button for several seconds until it gives up and shuts off.

Hold down the Command and R keys, and power the Mac back up again. Keep pressing Command+R while your Mac is booting up.

Once your Mac starts in Recovery Mode you will gain access to Utilities.

In Recovery Mode you can do the following:

Restore from a Time Machine backup
Use Disk Utility to verify and repair connected drives
Check your Internet connection
Get help online using Safari
Install or re-install macOS