HP T5720 Troubleshooting Guide - HP Compaq t5000 Series Thin Client, 8th Editi - Page 33
Power-On Diagnostic Tests
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Diagnostics and Troubleshooting Power-On Diagnostic Tests 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 Description Boot Block Checksum Tests boot block code for proper checksum value DRAM Simple write/read pattern test of the first 640k of memory Parallel port Initiates the port's driver and determines if the device is present Serial port Tests the serial port using simple port verification test to determine if ports are present Timer Tests timer interrupt by using polling method RTC CMOS battery Tests integrity of RTC CMOS battery NAND Flash device Tests for proper NAND flash device ID present Troubleshooting Guide www.hp.com 4-3