Several years ago, I was helping a client upgrade her Mac running Mac OS X 10.5 Leopard, but she couldn’t remember her administrator password. Because she also couldn’t find the original system CDs that shipped with her iMac, I had to resort to some advanced techniques few home users would ever be able to figure out.
Starting with 10.7 Lion, you could still call on all those options, but Apple added a method so easy that even an inexperienced user can do it — the Apple ID-based password reset. Now that 10.10 Yosemite has been released, a few of these options are no longer available. Let’s explore all the options to reset a password. Which you should use depends on the specific version of Mac OS X, and how the Mac is set up.