Clearing Passwords; Power-On Self-Test (Post) - HP ProSignia 120 Maintenance And Service Manual

2.2 Clearing Passwords

The power-on password prevents use of the computer until the password is entered.
The setup password prevents unauthorized changes to Computer Setup. To clear the
passwords, you must remove all power from the system board. If you do not know the
passwords, use the following procedure to clear the password:
1. Remove all battery packs from the battery bay and MultiBay, if applicable.
2. Disconnect the AC power.
3. Remove the real-time clock battery.
4. Wait five minutes.
5. Reconnect the AC power.
6. Restart the computer. During Power-On Self Test (POST), a "162 System Options
not set" message appears.
7. Shut down the computer, then disconnect AC power again.
8. Replace the real-time clock battery.
9. Install the battery pack(s).
Proceed with the troubleshooting procedures.

2.3 Power-On Self-Test (POST)

The Power-On Self-Test (POST) is a series of tests that run every time the computer is
turned on. POST verifies that the system is configured and functioning properly.
To run POST, complete the following steps:
1. Complete the preliminary steps (Section 2.1).
2. Turn on the computer.
If POST does not detect any errors, the computer beeps once or twice to indicate that
POST has run successfully. The computer boots from the hard drive or from a bootable
diskette if one is installed in the diskette drive.
Troubleshooting 2-3