I did a re-install of OSX 10.5 on my Powerbook G4 and had no problem installing the updates until I got to 10.5.8. It asked me for both my username/password but kept giving me an "Invalid username or password" error message. Even when I went into Accounts or rebooted the machine with the install disk and changed the password, it still won't accept it. Is there a workout around for this like disabling the whole user/pass feature? It's easy to do in Linux.