This is a part of collection of HP-UX tips from the time I worked as system admin:
The information below is the result of my researches in the Internet and of my experiences. It is solely used for my purpose and may not be suitable for others.
1) Reset the system console by turning off the console.
2) Hold down the "D" key and continue to hold the key down while powering up the console.
3) Wait 10 - 15 seconds, and then release the key.
4) A message should appear in the lower left-hand part of the screen displaying:
'Default configs used, press any key to clear'