Compaq Prolinea Family Maintenance & Serice Manual page 21

Chapter 2. Troubleshooting
Chapter 2.0 Introduction
This chapter describes the three levels of troubleshooting for the
computer:
o Power-On Self-Test (POST)
o Compaq diagnostics
o Troubleshooting without diagnostics
POST messages, diagnostic error codes, and memory error codes are
included. The messages and codes appear in tables that include a
description of the error, the probable cause, and the recommended action
to resolve the error condition. Adherence to the procedures and
precautions described in this chapter is essential for proper service.
Chapter 2.1 Power-On Password
The power-on password prevents use of the computer until the password is
entered. To clear the power-on password, you must remove and replace a
jumper on the system board. If you do not know the power-on password, use
the following procedure to clear the password to allow troubleshooting:
1. Complete the preparation for disassembly procedures in Section 5.3.
2. Remove the unit cover as described in Section 5.4.
3. Move the jumper on E6 (Figure 2-1) from pins 1 and 2 and to pins 2
and 3.