Acer Veriton S4660G Recycling Manual

Contents

Acer Veriton S4660G Recycling Manual Manual pdf 18 page image

18TroubleshootingThis chapter provides troubleshooting information for the Veriton S series Service Guide Power-On Self-Test (POST) POST Error Messages ListPower-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 forthe 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, itdisplays 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 functionalityare 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