Forgotten the admin password on your Mac? You can reset the welcome system that you usually get immediately after installing OS X (the welcome video followed by the lengthy, intrusive set of forms) to create a new admin account using the following steps:
- Hold command + s as soon as you hear the chime
- You will be presented with a super user prompt, enter the following:
mount -uw / rm /var/db/.AppleSetupDone reboot
After rebooting and following the welcome process, you will have a new admin account. Login as the new admin and reset the old admin’s password, you can then log in as the old admin and delete the new admin account.