Power-On Diagnostic Tests - HP Compaq t5125 Troubleshooting Manual

Power-On Diagnostic Tests

✎
Troubleshooting Guide
The Power-on diagnostics performs basic integrity tests of the
hardware to determine its functionality and configuration. If a
diagnostic test fails during hardware initialization the unit simply
stops. There are no messages sent to video.
You may try to restart the unit and run through the diagnostic tests a
second time to confirm the first shutdown.
The following table lists the tests that are performed on the t5000
units.
Power-On Diagnostic Test
Test
Boot Block Checksum
DRAM
Parallel port
Serial port
Timer
RTC CMOS battery
NAND Flash device
www.hp.com
Diagnostics and Troubleshooting
Description
Tests boot block code for proper
checksum value
Simple write/read pattern test of
the first 640k of memory
Initiates the port's driver and
determines if the device is
present
Tests the serial port using simple
port verification test to determine
if ports are present
Tests timer interrupt by using
polling method
Tests integrity of RTC CMOS
battery
Tests for proper NAND flash
device ID present
4-3