Factory reset PPC iMac G5

[Orcvader]

Have an old PPC iMac G5 in the office at work, and we want to factory reset it. Problem is, the original owner has forgotton his password to the account and has lost the original install discs.

Is there any other way to factory reset the Mac?

 

[Orcvader]

Bit of a bump but only just had some free time. The commands didn't work, it can't find the file to load.

However using this command in single user mode allowed me to create another admin account:

rm /var/db/.applesetupdone

Deleted the old account and now it's sorted.

Now need to work out how to bring it back up to speed...