How to reset the system on Apple computers
1. First turn on your Mac, and then immediately hold down the Command (⌘) and R keys.
2. Release these two buttons when you see the Apple logo, rotating globe, or other startup screen.
3. The system may prompt you to enter a password, such as the firmware password, or the password of the administrator user of this Mac.
4. When you see the "Utilities" window, the startup is complete:
5. Restore from macOS After the feature launches, select a utility and click Continue:
Restore from a Time Machine backup: Restore your Mac from a Time Machine backup.
Reinstall macOS: Download and reinstall Mac OS.
Get online help: Use Safari to browse the web and find help for your Mac. This utility contains a link to the Apple Support website. Browser plug-ins and extensions will be disabled.
Disk Utility: Use Disk Utility to repair or erase your startup disk or other storage device.
The Utilities menu in the menu bar provides additional utilities: Startup Security Utility (or Firmware Password Utility), Network Utilities, and Terminal.
To exit macOS Recovery, choose Restart or Shut Down from the Apple menu. If you need to select another startup disk before exiting, choose Startup Disk from the Apple menu.
Refer to Apple’s official tutorial: https://support.apple.com/zh-cn/HT201314
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