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3-4 Diagnostic Tools
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:
■ Processors
■ Keyboard
■ Power supply
■ System board
■ Memory
■ Memory expansion boards
■ Controllers
■ Diskette drives
■ Hard drives
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,
follow the instructions in Table 3-1. The error messages and codes listed in Table 3-1 include all
codes generated by Compaq products. Your system generates only those codes that are
applicable to your configuration and options.
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.
Table 3-1
POST Error Messages
Error Code
Audible Beeps
L=Long S=Short
Probable Source of Problem
Recommended Action
A Critical Error
occurred prior to
this power-up
None A catastrophic system error,
which caused the server to
crash, has been logged.
Run Diagnostics. Replace failed
assembly as indicated.
101-ROM Error 1L,1S System ROM checksum. Run Diagnostics. Replace failed
assembly as indicated.
101-I/O ROM Error None Options ROM checksum. Run Diagnostics. Replace failed
assembly as indicated.
102-System Board
Failure
None DMA, timers, and so on. Replace the system board. Run the
Compaq System Configuration Utility.
104-ASR-2 Timer
Failure
None System board failure. Run Diagnostics. Replace failed
assembly as indicated.
Continued