Diagnostics and Troubleshooting 3-7
Power-On Self-Test
Power-On Self-Test (POST) is a series of diagnostic tests that automatically run on Compaq
computers when the system is powered up. 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
■ Fans
POST Error Messages
If POST finds an error in the system, an error condition is indicated by an audible and 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 (Table 3-2).
NOTE: Many of the actions listed require you to run Diagnostics or the System Configuration Utility.
Steps for running these utilities are provided following the POST Error Messages tables.
The Recommended Action column in Table 3-2 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 is redisplayed, perform the next step, and then run the
Diagnostics program again. Follow this procedure until Diagnostics no longer detects an error
condition.
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