My brother forgot the password to his iBook's only administrator account. I booted the computer using the OS X Tiger install disc, and then used the Password Reset Utility to set a new password for his user account. I then rebooted the computer. The computer asked me to log in. This is odd, because he has the computer set to automatically log in. Anyway, I input his username and the new password. The computer rejected the new password, which I am absolutely sure was spelled and typed correctly. I tried entering the password using both his short name and long name. Neither worked. I rebooted the computer, and once again booted to the Mac OS X install disc. I attempted to use the password reset utility again, however this time the password reset utility claims that Macintosh HD has no user accounts. How should I proceed from here, making sure not to lose any data?