User accounts missing after post install reboot and cannot login

The 10.5 install process completed and my mac mini rebooted and came up with the login screen. None of my user accounts show - my admin user and my regular user account (also has admin privs) are not available and all I can chose is 'Other' - I have enter both my user accounts and passwords but they are not accepted.
I then restarted from the Leopard disk, cancelled the install program and used the password utility to reset these passwords and all the accounts show up in the selections (including a guest one I have set up).
I'm stuck here - can get no further. Only option seems to be restarting the install from scratch unless anyone else has a good suggestion?

Ok now restarted the install process (by selecting back from the login screen and then selecting restart from the login screen that showed the 'Other' user account only. I held down the c on the keyboard until the restart took the Leopard disc which was in the drive.
Then I went thru the install steps (language, license agree etc) and when it asked for what disk to install on I selected the mac mini HDD ad then clicked the options button to select the Archiv and Install option (rather than the Update only option I had been doing).
The install process purred through ok and I am up and running.
Now on to my MacBook Pro .....Thanks for the help and suggestions all

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User accounts missing after post install reboot and cannot login

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