How to reset an iMac


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I have a 21.5 inch iMac i5 processor that I wish to sell. How do I reinstall the operating system so that
all of my data is erased and cannot be recovered?
Thanks,
capreol
 
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  1. Restart in Recovery Mode.
  2. Erase Data from Mac Hard Drive.
  3. a. In the macOS Utilities window, choose Disk Utility and click Continue.
  4. b. Choose your startup disk and click Erase.
  5. c. Choose Mac OS Extended (Journaled) as the format.
  6. d. Click Erase.
  7. e. Wait until the process is finished. ...
  8. Reinstall macOS (optional)
 
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How do I reinstall mac OS after I do numbers 1 to 7 above?
Thanks,
capreol
 
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There will be an option to reinstall the OS in the macOS utilities window.
 
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Follow these steps:

  1. Restart in Recovery Mode.
  2. Erase Data from Mac Hard Drive.
  3. a. In the macOS Utilities window, choose Disk Utility and click Continue.
  4. b. Choose your startup disk and click Erase.
  5. c. Choose Mac OS Extended (Journaled) as the format.
  6. d. Click Erase.
  7. e. Wait until the process is finished. ...
  8. Reinstall macOS (optional)
 

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