Final answer:
To reset a Mac to its original settings, enter Recovery Mode by restarting and holding Command-R, use Disk Utility to erase the startup disk, then choose Reinstall macOS from the macOS Utilities window. Follow the prompts to reinstall the operating system, thus restoring the Mac to factory settings.
Step-by-step explanation:
To reset a Mac to its original settings, you need to erase the hard drive and reinstall the operating system. This process will remove all personal data and restore the computer to its factory state. Before proceeding, ensure you have backed up any important data.
- Restart your Mac and immediately hold down the Command (⌘) and R keys until the Apple logo or another image appears. This boots your Mac into Recovery Mode.
- From the macOS Utilities window, select Disk Utility and click Continue.
- Select your startup disk (usually named 'Macintosh HD') on the left and click the Erase button.
- Choose a file system format. If you're reinstalling macOS High Sierra or later, select APFS; otherwise, select Mac OS Extended (Journaled). Name the disk, if you wish, then click Erase again.
- Once the disk is erased, exit Disk Utility to return to the macOS Utilities window.
- Select Reinstall macOS and click Continue. Follow the onscreen instructions to reinstall macOS.
- Once the installation is complete, your Mac will restart to a welcome screen and you can set it up as if it were new.
If you're planning to sell or give away your Mac, avoid entering any personal information during the setup process. Instead, press Command-Q and let the new owner complete the setup.