Acer Veriton S6660G Recycling Guide - Page 18

Troubleshooting This chapter provides troubleshooting information for the Veriton S series 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 18