I learned the hard way that the resetting the Open Firmware on an older Mac -- my beige G3, for example -- requires a slight change in the initial command after a Command-Option-O-F startup. reset-nvram works on my G4 and is acknowledged by ok, but on my beige G3, it results in an unknown word response.
Thanks to a helper in one of the apple.com forums for older Macs, I learned to make my first command init-nvram. On the beige G3 as well as G4s, one starts the procedure by zapping PRAM and then quickly changing fingers from the P-R keys to the O-F keys, and holding until a prompt comes up. After typing the proper first command for your hardware, follow that up with set-defaults and then reset-all.
Thanks to a helper in one of the apple.com forums for older Macs, I learned to make my first command init-nvram. On the beige G3 as well as G4s, one starts the procedure by zapping PRAM and then quickly changing fingers from the P-R keys to the O-F keys, and holding until a prompt comes up. After typing the proper first command for your hardware, follow that up with set-defaults and then reset-all.
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