15
Troubleshooting
This chapter provides troubleshooting information for the Veriton X4230G Service Guide
Power-On Self-Test (POST)
POST Error Messages List
Power-On Self-Test (POST)
Each time you turn on the system, the Power-on Self Test (POST) is initiated. Several items are tested during POST, but
for the most part transparent to the user.
The Power-On Self Test (POST) is a BIOS procedure that boots the system, initializes and diagnoses the system
components, and controls the operation of the power-on password option. If POST discovers errors in system
operations at power-on, it displays error messages on screen, generates a check point code at port 80h or even halts
the system if the error is fatal.
The main components on the main board that must be diagnosed and/or initialized by POST to ensure system
functionality are as follows:
Microprocessor with built-in numeric co-processor and cache memory subsystem
Direct Memory Access (DMA) controller
Interrupt system
Three programmable timers
ROM subsystem
RAM subsystem
CMOS RAM subsystem and real time clock/calendar with battery backup
Onboard parallel interface controller
Embedded hard disk interface and one diskette drive interface
Keyboard and auxiliary device controllers
I/O ports
One parallel port
One PS/2-compatible mouse port
One PS/2-compatible keyboard port
