United States December 31, 2002
Maintenance & Service Guide
Presario 7800 Series and 5900T 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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