IBM 436854u Service Guide - Page 139

Diagnostics, Diagnostic tools, POST, POST beep codes, error messages, and error logs

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Chapter 5. Diagnostics This chapter describes the diagnostic tools that are available to help you solve problems that might occur in the server. If you cannot diagnose and correct a problem by using the information in this chapter, see Appendix A, "Getting help and technical assistance," on page 231 for more information. Diagnostic tools The following tools are available to help you diagnose and solve hardware-related problems: v POST beep codes, error messages, and error logs The power-on self-test (POST) generates beep codes and messages to indicate successful test completion or the detection of a problem. See "POST" for more information. v Troubleshooting tables These tables list problem symptoms and actions to correct the problems. See "Troubleshooting tables" on page 139. v Server LEDs Use the LEDs on the server to diagnose system errors quickly. See "Error LEDs" on page 152 for more information. v Diagnostic programs and messages The Dynamic System Analysis (DSA) diagnostic programs are the primary method of testing the major components of the server. The DSA diagnostic programs are on the IBM Dynamic System Analysis Preboot Diagnostic CD. See "Diagnostic programs and messages" on page 155 for more information. POST When you turn on the server, it performs a series of tests to check the operation of the server components and some optional devices in the server. This series of tests is called the power-on self-test, or POST. If a power-on password is set, you must type the password and press Enter, when you are prompted, for POST to run. If POST is completed without detecting any problems, one short beep occurs, and the server startup is completed. If POST detects a problem, several beeps might sound, or an error message is displayed. See "POST beep codes" on page 122 and "POST error codes" on page 127 for more information. © Copyright IBM Corp. 2008 121

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Chapter 5. Diagnostics
This chapter describes the diagnostic tools that are available to help you solve
problems that might occur in the server.
If you cannot diagnose and correct a problem by using the information in this
chapter, see Appendix A, “Getting help and technical assistance,” on page 231 for
more information.
Diagnostic tools
The following tools are available to help you diagnose and solve hardware-related
problems:
v
POST beep codes, error messages, and error logs
The power-on self-test (POST) generates beep codes and messages to indicate
successful test completion or the detection of a problem. See “POST” for more
information.
v
Troubleshooting tables
These tables list problem symptoms and actions to correct the problems. See
“Troubleshooting tables” on page 139.
v
Server LEDs
Use the LEDs on the server to diagnose system errors quickly. See “Error LEDs”
on page 152 for more information.
v
Diagnostic programs and messages
The Dynamic System Analysis (DSA) diagnostic programs are the primary
method of testing the major components of the server. The DSA diagnostic
programs are on the IBM
Dynamic System Analysis Preboot Diagnostic
CD. See
“Diagnostic programs and messages” on page 155 for more information.
POST
When you turn on the server, it performs a series of tests to check the operation of
the server components and some optional devices in the server. This series of tests
is called the power-on self-test, or POST.
If a power-on password is set, you must type the password and press Enter, when
you are prompted, for POST to run.
If POST is completed without detecting any problems, one short beep occurs, and
the server startup is completed.
If POST detects a problem, several beeps might sound, or an error message is
displayed. See “POST beep codes” on page 122 and “POST error codes” on page
127 for more information.
© Copyright IBM Corp. 2008
121