If you intend on selling or giving away your Mac, you may want to take a few minutes to sign out of both iMessage and iCloud. Don’t worry-you won’t need any external macOS installation media. The procedure involves wiping the startup disk and reinstalling the system software. If you use an Intel Mac without an Apple T2 Security Chip, you must enter and use macOS Recovery to reset your Mac to factory defaults. For comprehensive step-by-step instructions, check our guide to restoring a Mac using Time Machine. You can skip that if you want and use the Migration Assistant to restore everything later. Learn more about reinstalling m acOS.If you choose to set up your Mac, you’ll be given the option of restoring your Mac’s data via a Time Machine backup.

If you want your Mac to start up again from the volume you just you erased, select Reinstall macOS in the utilities window, then click Continue and follow the onscreen instructions.

When done, quit Disk Utility to return to the utilities window.

Optional: If you previously used Disk Utility to add internal volumes other than Macintosh HD, you can erase them individually using the same process.

If this button isn't shown, click Erase instead.

Format: APFS or Mac OS Extended (Journaled), as recommended by Disk Utility.

Click the Erase button in the toolbar, then enter the requested details:.

Select Macintosh HD in the sidebar of Disk Utility.

From the utilities window, select Disk Utility and click Continue.If asked, select a user you know the password for, then enter their administrator password.Start up from macOS Recovery: Turn on your Mac, then immediately press and hold these two keys until you see an Apple logo or other image: Command (⌘) and R.

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