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Maintenance and Service Guide 2-1
2.1 INTRODUCTION
This chapter provides a list of the subassemblies
that are tested by the Power-On Self-Test (POST),
a list of steps that you should perform prior to
going through the problem isolation procedures,
and a problem isolation flowchart for quick
reference.
2.2 POWER-ON
SELF-TEST (POST)
A series of diagnostics tests automatically runs
on every COMPAQ personal computer system
when you turn on the system. These tests are
called Power-On Self-Tests (POST).
POST checks the following subassemblies to see
if the computer system is functioning properly:
□ Power supply
□ System board
□ Memory
□ Keyboard
□ Controller boards
Turning on the computer automatically activates
POST. If POST finds an error in the system, error
codes (in the form of beeps) are heard or error
codes (numbers) are visible on the monitor. See
Chapter 5, ERROR MESSAGES AND CODES,
for definitions of the error codes.
Chapter 2
POWER-ON SELF-TEST
(POST)/PROBLEM ISOLATION