How do I restore my old MacBook pro to factory settings?
To do so, shut down your Mac, then turn it on and immediately press and hold four keys together: Option, Command, P, and R. You can release the keys after 20 seconds or so. That’s it!
How do I factory reset my MacBook Pro 2010?
As it’s loading hold the Command button and the R key. Something will come up called OS X Utilities. Click on Disk Utility and click on “Mac OS Extended”. Then, click Erase.