How to wipe a Mid-2011 iMac Macintosh HD running High Sierra
want to wipe clean a mid-2011 iMac Macintosh HD running High Sierra before donating. How do I do this?
Question marked as
This: What to do before you sell...your Mac - Apple Support
Follow the guidance there under "If you can’t use Erase All Content and Settings"
And you don't have to reinstall macOS.
