macintosh boot locked

I got a problem with my Mac G4 cube, I've upgraded OS 9 to 10.3 and when I finished the installation, everything was fine suddenly the system came with error message that had detect another HD and need to restart, I restart but it locked the boot and always give two options on dos prompt "mac-boot" or "shut-down" , I choose mac-boot but it locked with interrogation icone flashing on screen, please someone could help-me?  
Darlly01Asked:
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harripappiCommented:
ok. pop in the upgrade cd and reboot. hold the option key while you are rebooting. different options should put up, and you may want to do another upgrade.
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idarmadiCommented:
Darlly,

Have you perform firmware update (is your cube's firmware updated?)?
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