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Aug 17, 2016 7:47 AM in response to CULTURALINNOVATby lllaass,I would just do this:
What to do before selling or giving away your Mac - Apple Support
and start over again
If the ID was used for login you can reset the admin PW by:
However, if their ID was used for upgrading the OSX version that OSX version would be locked to ID that "purchased' the update and any apps too. That is why it is better to setup as new