Jason, I found an Apple TIL which describes how to reset nvram. First 
zap the PRAM, if that doesn't work then also reset nvram in Open Firmware.
Here's what you have to type in exactly in Open Firmware (also see 
bottom of this email):

1. At the Open Firmware prompt, type: reset-nvram
2. Press Return.
3. At the Open Firmware prompt, type: reset-all
4. Press Return.

Example:
0 > reset-nvram
Press Return
0 > reset-all
Press Return


TOPIC
The computer starts up regularly to an Open Firmware prompt. Resetting
the Open Firmware settings should resolve this.


--------------------------------------------------------------------------------

DISCUSSION

Symptom

Every time the computer starts up, a text-based command-line-interface
appears that says:

"To continue booting, type "mac-boot" and press return.
To shut down, type "shut-down" and press return.

ok
0 > _

If you type mac-boot the computer starts up normally; if you type
shut-down the computer shuts down normally, but the command line
interface still appears every time you start up the computer.

Products affected

iMac - all models
iBook - all models
Power Macintosh G3 (Blue and White)
Power Mac G4 - all models
PowerBook G4 - all models
PowerBook (FireWire)
PowerBook G3 Series (Bronze Keyboard)

Solution

Reset the computer's parameter RAM (PRAM). See technical document 2238
"Macintosh: How to Reset PRAM and NVRAM." 
<http://www.info.apple.com/kbnum/n2238>

If this does not resolve the symptoms or you are unable to reset PRAM,
then reset the Open Firmware settings by following the steps listed
below.

1. At the Open Firmware prompt, type: reset-nvram
2. Press Return.
3. At the Open Firmware prompt, type: reset-all
4. Press Return.

Example:
0 > reset-nvram
Press Return
0 > reset-all
Press Return

<http://docs.info.apple.com/article.html?artnum=42642&SaveKCWindowURL=http%3A%2F%2Fkbase.info.apple.com%2Fcgi-bin%2FWebObjects%2Fkbase.woa%2Fwa%2FSaveKCToHomePage&searchMode=Assisted&kbhost=kbase.info.apple.com&showButton=false&randomValue=100&showSurvey=false&sessionID=anonymous|158984093>








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