Compaq Presario 7400 Series Maintenance And Service Manual page 140

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Maintenance and Service Guide
Compaq Presario 7400 Series Computers
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Troubleshooting
Clearing CMOS
Power-On Self Test
(POST)
Configuration
Diagnostics Software
Troubleshooting without
diagnostics
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Product Description
Removal & Replacement
TROUBLESHOOTING
Power-On Self Test (POST)
POST is a series of diagnostic tests that run automatically when the system is turned on. After the
computer is turned on, POST checks the following assemblies to ensure that the computer system is
functioning properly:
Keyboard
System board
Memory modules
Video memory
Diskette drives
Hard drive
Power supply
POST also detects the type of mass storage devices installed in the computer.
If POST finds an error in the system, an error condition is indicated by an audible and/or visual
message. The table below gives explanations of the error codes and a recommended course of action.
An external speaker must be installed into the speaker output connector to
NOTE:
hear audible beeps during POST.
Click a link below to find the probable cause and recommended action for a given error message.
Diskette Drive A or B Error
Troubleshooting
Jumper & Switch Information
Keyboard Controller Error
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Illustrated Parts Catalog
Specifications
System BIOS Shadowed