- Click the Apple icon in the menu bar (top-left corner).
- Select System Preferences from the drop-down menu.
- Select 'Erase All Contents and Settings. '
- Enter your password, select 'OK. '
- Select the 'Erase All Content & Settings' button.
How do I reset my Mac to factory settings when it wont turn on?
- Enter your Mac's Recovery mode.
- Select Disk Ultility from the options you're given.
- Find your system disk in the list, and select it.
- Click Erase.
- When it's done, quit Disk Utility, and select Reinstall macOS.
- Click Continue and accept the license agreement.