Picked up older powermac G4 from a garage sale. Can not do any updates because owner, that has now moved did not wipe it clean and I need a password to do anything. Is there a way to restore to factory default and make myself admin?

Recently purchased older powermac G4 at a garage sale. Unable to do anything because owner, that has now moved, did not wipe it clean and everything I try to do requires his password. Is there a way to restore to factory default, make myself admin and reset password? Hoping this purchase wasnt a complete waste of my time and money.

Here's the instructions if you have the discs.
Mac OS X: Changing or resetting an account password
http://support.apple.com/kb/HT1274?viewlocale=en_US
Changing your administrator password
http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh655.html
Here's one method to reset the password without the install disc:
1. boot computer and hold the "apple" key and the "s" key.
2. wait for terminal show
3. release keys
4. type without the quotes: "/sbin/mount -uaw"
5. press enter
6. type without the quotes: "rm /var/db/.applesetupdone
7. press enter
8. type without the quotes: "reboot"
9. press enter
This will let you create a new admin account when you reboot your computer.
Also, without the discs, look at Mac OS X Tip - No Password, No Root, No CD? No Problem.
http://www.macobserver.com/tip/2003/06/16.1.shtml
Here is a way to get around not knowing the admin password on Macs.
To reset your OS X password without an OS X CD you need to enter terminal and create a new admin account:
   1. Reboot
   2. Hold apple + s down after you hear the chime.
   3. When you get text prompt enter in these terminal commands to create a brand new admin account (hitting return after each line):
          * mount -uw /
          * rm /var/db/.AppleSetupDone
          * shutdown -h now
   4. After rebooting you should have a brand new admin account. When you login as the new admin you can simply delete the old one and you’re good to go again!
Not sure is this will work on a Mac running OS 9.
 Cheers, Tom

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