Power-On Self-Test (Post) - Compaq DESKPRO 2000 SERIES Maintenance & Service Manual

2.2 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
Mouse
System board
Memory modules
Video
Diskette drives
Hard drives
Power supply
Controllers
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. Table 2-1 gives explanations of the error codes and a recommended course of action.
Compaq Deskpro 2000 2-3