you will find password utility in the utilities folder, in the menu bar, once you start to move through the install program.
Do not proceed with the installation after you can see the menu bar at the top of the screen
I have an iBook G4 700MHz 60Gb which has been running 10.4. It's about 7 years old.
A few days a go it stopped booting up and just left a grey screen. I looked on the Apple website which suggested using the original system disks to access disk doctor and check the hard drive. I did this and many errors were found, most seemed to be fixed but I was left withe message that 1 volume had been repaired but that another couldn't be. It then booted up and worked fine for about 24 hrs when it stopped again. The same process worked again but left the same message so I decided to reinstall the system. I backed up the user folder and opted for the installation that leaves the old system in a folder. The reinstall seemed to work ok, but I was warned that there wouldn't be much HD space free. I have now started the boot-up but when I am prompted for the password it wont accept it, it just gives the 'shiver'. So I am stuck.