Someone else locked the computer — I don’t know the pin?
How do I get the pin for my IMac that was locked by my friend in accident?
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Is your Mac at the login window? Please see this link and follow the instructions provided
https://support.apple.com/en-us/HT202860
Is your computer starting up to a screen with a lock on it? The Mac is firmware password protected Follow these steps to remove the firmware password
- Start up from macOS Recovery. During startup, you will be prompted to enter the firmware password.
- When the utilities window appears, click Utilities in the menu bar, then choose Startup Security Utility or Firmware Password Utility.
- Click Turn Off Firmware Password.
- Enter the firmware password again when prompted.
- Quit the utility, then choose Apple menu > Restart.