Specifications

Diagnostic Tools 3-7
For use with Pentium II and Pentium III Xeon processor-based servers only
Power-On Self-Test (POST)
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 supply
■ System board
■ Memory
■ Memory expansion boards
■ Controllers
■ Diskette drives
■ Hard drives
■ Processor power modules
■ Fans
POST Error Messages
If POST finds an error in the system, an error condition is indicated by an audible and/or visual
message. If an error code displays on the screen during POST or after resetting the system, use
the instructions in the POST Error Messages table. The error messages and codes listed include
all codes generated by Compaq products. The system generates only those codes that are
applicable to the configuration and options.
NOTE: Many of the actions listed require you to run Diagnostics or the Compaq System Configuration
Utility. Steps for running these utilities are provided in this chapter following the POST Error Messages
tables.
In each case, the Recommended Action column 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.