Diagnostic Tools; Power-On Self-Test (Post) - Compaq AP400 Maintenance And Service Manual

Chapter 4

Diagnostic Tools

This chapter provides the following information to assist you when servicing the Compaq
Professional Workstation AP400:

Power-On Self-Test (POST)

Compaq Setup and Diagnostics Utilities
Error Codes
ROMPaq
Compaq Insight Manager
Compaq Workstation Support Software for Microsoft Windows NT
Compaq Diagnostics for Windows NT
IMPORTANT: Adherence to the procedures and precautions described in this chapter is
essential for proper service.
Power-On Self-Test (POST)
POST is a series of diagnostic tests that runs automatically when the system is turned on. After
the computer is turned on, POST checks the following assemblies to make sure that the
computer system is functioning properly:
Keyboard
DIMMs
Graphics controller
Diskette drives
IDE/CD-ROM or DVD-ROM drive
Hard drives
Processors
Controllers
POST also detects the type of SCSI mass storage devices installed in the workstation.
NOTE: If the Power-on Password is set, a key icon (
running. You will need to enter the password before continuing. See Chapter 5 for information on
deleting or bypassing the Power-on Password.
If POST finds an error in the system, an audible and/or visual message occurs. For explanations
of the error codes and a recommended course of action, see Table 4-1 in the next section.
) appears on the screen while POST is
Compaq Professional Workstation AP400 Maintenance and Service Guide
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