Power-On Self-Test (Post) - Compaq AP200 Maintenance And Service Manual

4-2 Diagnostic Tools

Power-On Self-Test (POST)

POST is a series of diagnostic tests that runs automatically when the system is turned on. After
the computer is turned on, POST checks the following assemblies to make sure that the
computer system is functioning properly:
Keyboard
DIMMs
Graphics controller
Diskette drives
IDE/CD-ROM drive
Hard drives
Processor
Controllers
POST also detects the type of SCSI mass storage devices installed in the workstation.
NOTE: If the Power-On Password is set, a key icon (
running. You will need to enter the password before continuing. See Chapter 5 for information on
deleting or bypassing the Power-On Password.
If POST finds an error in the system, an audible and/or visual message occurs. For explanations
of the error codes and a recommended course of action, see Table 4-1 in the next section.
) appears on the screen while POST is