May 21, 2019  · How to reset your Mac before selling it. you can erase everything on it by reformatting the hard drive. Restart your Mac. While the startup disc is waking up, If you follow the steps above, the information stored in the Touch Bar of your MacBook Pro will be securely erased. However, if you’ve decided to use a third-party program or used. Jul 28, 2011  · Insert SL DVD…