I recently had a rare opportunity to work on a Macbook. A regular “subscriber” client called to say that her daughter didn’t need her 2008 Macbook and was giving it to her brother. She wanted all the data removed and wanted it reset to as it was when it was new.
The sister lived in Australia, so there was no UK power supply (no power supply at all), so I recommended that the client take it to the Apple Store as third party chargers are becoming less reliable. The new charger didn’t seem to be working properly, but it was the Macbook power socket was dirty so I cleaned it up.
There were a few problems because Mac OS had been updated, but we didn’t have the Apple ID for the person who did the update, but I overcame that problem finished the job.