Factory reset iMac
How to get to recovery mode to reset iMac
iMac Line (2012 and Later)
How to get to recovery mode to reset iMac
iMac Line (2012 and Later)
See the following blue-text link for: What to do before you sell, give away, or trade in your Mac - Apple Support
Or, depending on what you are doing: How to erase an Intel-based Mac - Apple Support
See the following blue-text link for: What to do before you sell, give away, or trade in your Mac - Apple Support
Or, depending on what you are doing: How to erase an Intel-based Mac - Apple Support
Pretty simply, hold down Command + R on startup.
Factory reset iMac