ProLiant ML530 Servers Maintenance and Service Guide

Diagnostics and Troubleshooting 3-7
Power-On Self-Test
Power-On Self-Test (POST) is a series of diagnostic tests that run automatically on Compaq
computers when the system is turned on. POST checks the following assemblies to ensure that
the computer system is functioning properly:
■ System ROM
■ Keyboard
■ Power supplies
■ System board
■ Memory
■ Controllers
■ Diskette drives
■ Hard drives
■ Fans
POST Error Messages
If POST finds an error in the system, it issues an audible sound, visual message, or both. If an
error code displays on the screen during POST or after resetting the system, follow the
instructions in the POST Error Messages table.
NOTE: Many of the actions listed require you to run Diagnostics or the Compaq System Configuration
Utility. Steps for running these utilities are provided following the POST Error Messages table.
The Recommended Action column of the table lists the steps necessary to correct the problem.
After completing each step, run the Diagnostics program to verify whether the error condition
has been corrected. If the error code reappears, perform the next step, then run the Diagnostics
program again. Follow this procedure until Diagnostics no longer detects an error condition.