Maintenance & Service Guide
Presario 5800 Series Personal Computers
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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 drive
- Hard drive
- CD (or DVD) 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 or
visual message.
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