G5 unusable, can't login with any users

Hi, and thanks in advance for helping.
The iMac doesn't accept any user name and password at start up. I tried to change the admin password from the "Change Password" appl form Install Disk 1, and after selecting the Mac HD it says "No Users Found". Then i tried to reinstall the system, and after that same thing, it starts up but i can't loggin in any way.
Any hints? Could you help me?
Thank you, and forgive my poor english
Roberto

Do you have an external clone? If it starts up from this, you can reinstall your system from the clone. Have you enabled
FileVault? if so, you need your master password.Did you follow these instructions for resetting your password?
Have you tried starting in single user or verbose mode?
1. Shut down the computer if it is on.
2. Press the power button to start the computer.
3. Immediately press and hold the Command (Apple) key and one of the following:
the "s" key for single-user mode.
the "v" key for verbose mode.
4. To exit single-user mode type: reboot
5. Press Return.
Hope some of this helps,
Miriam

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