Mac OS X Server 1.x: Restoring a Lost Root Password
The root password is essential to system security and should always be safeguarded. Unfortunately, anything can be lost, and a password is no exception.
The first step to changing a lost password is to boot into single-user mode. For more information on booting into single user mode, please see the following :
Article 30837: "Mac OS X Server: Booting Into Single-user Mode"
The system starts up, displaying a series of messages. When startup is complete, you see the single-user prompt "#." Type the following command at the prompt:
You see a series of messages appear on the screen as the rc shell script executes. During this process, NetInfo is started. You won't see a shell prompt after these messages unless you press the Return key.
Set the root password. Enter the following command at the prompt:
You're prompted twice for the new password.
Once the password has been changed the system must be rebooted. To restart the computer, type the following command at the prompt:
shutdown -r now
The argument "now" in the commands above can be replaced with "+n", where "n" is the number of minutes to give other users time to log out.
Warning: You must restart the system as mentioned above. Do not boot into multiuser mode. If you do, you will start duplicate system services, which will cause a number of issues.