Ok, so the company you work for has given you a laptop and you wanna install some programs of your own or re:customize the machine and can’t because you don’t know the Administrator Password.

Here is what you do if Firmware Password is disabled:

1. shut down the Mac
2. Start up Mac holding down Command + s
3. You will see a black screen. Now type: /sbin/mount -uw /
4. passwd
5. passwd
6. After you’ve been prompted to retype the password you have chosen now type: reboot
7. When your Mac starts up go to your System Preferences/Accounts
8. Click on lock
9. Now type the following for the new admin: root
10. Now type what ever it was you typed for your password.

Now you can override your machine and customize it to your likings and change the password to the main admin account but only if you know the old password. If you don’t know the old password you won’t be able to change it (but) you will be able to create a new administrator account/new user and install programs and override any of the users on the machine.