SOLUTION : Pour ceux que cela interesse:
Après avoir insisté aupres de HP/Compaq, ceux ci m'ont donné la solution suivante que j'ai appliquée et qui marche! Je n'aurais pas pu l'inventer!!!
Nous avons pu retrouvé le manuel de maintenance de cet ancien appareil dans lequel est indiqué comment faire "sauter" le password ainsi que tous les paramètres du bios. Malheureusement, il s'agit d'une version anglaise, nous acceptons de vous le fournir tel quel. Nous ne pourrons pas être tenu responsable en cas de mauvaise manipulation.
If the password is unknown, clear it by completing the following steps:
1. Turn off the computer.
2. Disconnect the power cord.
3. Remove the battery pack.
4. Remove the keyboard cover.
5. Remove the keyboard, but don't disconnect the cable.
Place the keyboard toward the front of the system unit to access the jumper located near the lower-right corner of the processor board.
NOTE: The pins used by the jumper are labeled on the system board as "1", "2" and "3". (Pin "1" is toward the rear of the computer)
The jumper can be placed simultaneously on pins 1 and 2 (the "1-2" or "normal" position) or on pins 2 and 3 (the "2-3" or password-clearing position).
6. Move the jumper from the normal "1-2" position to the "2-3" position.
7. Insert the battery pack.
IMPORTANT: Ensure that the battery pack is charged since a low battery condition could initiate standby and interrupt the procedure.
8. Turn on the computer.
The ROM clears the power-on password during POST.
9. After POST finishes, turn off the computer.
10. Remove the battery pack.
11. Move the jumper back to the normal "1-2" position.
12. Insert the battery pack.
13. Turn on the computer to verify that the power-on password has been cleared. If it has not been cleared, remove the battery pack and then repeat steps 6 through 13. If the password is still not cleared, replace the system board.
14. Replace the keyboard.
15. Replace the keyboard cover.
16. Reconnect the power cord to the external outlet.
17. Run Computer Setup to reconfigurethe system and reset the power-on and setup passwords.
Cordialement,
le Service Clients de Hewlett Packard