Apple ID
How can I change an Apple iMac ID from the initial owner to my own ID
How can I change an Apple iMac ID from the initial owner to my own ID
Did the former owner erase the computer and set it up again? If not, you need to do that to make it 'your' computer. Start with step 6.
Selling old Mac (4) Apple support
Did the former owner erase the computer and set it up again? If not, you need to do that to make it 'your' computer. Start with step 6.
Selling old Mac (4) Apple support
Apple ID