Please help!!!How do I hack mac admin?Hi there...If you startup in single user mode you can change the root password, then log in as root and give yourself administrator privileges. However, the school may discover this change when your using their network and you could be caught because you can't restore the original root password.
Anyhow, assuming your machine isn't running off a NetBoot server*, consider reading the following websites:
http://docs.info.apple.com/article.html?
http://www.hmug.org/man/8/nidump.php
http://www.hmug.org/man/8/niload.php
Keep in mind that this is delving deep in to the computer's root system level, and that any tiny mistakes created are usually a) difficult to fix and b) often fatal.