So you have either forgotten your Mac User’s password or you need to change an existing user’s password without knowing the original password. You have come to the right place. In my case, I was working on a friends Macbook for them and they left it with me to work on and they forgot to give me the password so that I could login and fix the issues. I could have waited until I could reach them to get the password but then I started thinking….If I ask them for the password, then they are going to think I don’t know what I’m doing, especially if I have to ask/beg them for the password…..Or I could just reset it and let them wonder with amazement at how I gained access to their system so quickly.
This tutorial assumes that the Mac User in question probably didn’t password protect their firmware (Which is the default out-of-the-box option).
1.) Power on the Mac in question.
2.) Immediately after you power on the Mac, before you hear the initial mac boot sound, Press and hold the “Command” + “s” keys until the Mac boots into a command prompt.
3.) Once you get a root prompt type the following commands:
mount -uw /
4.) You will now be asked to enter in a new password for your user. Enter your new password.
5.) Now just type “reboot” and press return.
6.) You should now be able to login with the password that you just typed in.