To set your Mac to boot verbose
sudo nvram boot-args=”-v”
This applies to 10.4+ Macs. Use the “Firmware Password Utility” on your first install disk (found under /Applications/Utilities/.) This application will set your password for you. You will need to use your password to access any of the OpenFirmware commands.
To reset your NVRAM password
Turn on the computer.
Hold down “command+option+p+r” before the gray screen appears
Hold the keys until the computer resets and you hear the startup sound again.
Release the Keys
You will be prompted for your NVRAM password.