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HP t820 Maintenance & Service Manual: Resetting The Administrator And Power-on Passwords; Power-on Diagnostic Tests

Hp t820 flexible thin client maintenance & service guide.
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Resetting the Administrator and power-on
passwords
You can reset the Administrator and power-on passwords as follows:
1.
Turn off the computer and disconnect the power cord from the power outlet.
2.
Remove the side access panel and the metal side cover.
3.
Remove the password jumper from the system board header labeled PSWD.
4.
Replace the metal side cover and the side access panel.
5.
Connect the computer to AC power, and then turn on the computer.
6.
Turn off the computer and disconnect the power cord from the power outlet.
7.
Remove the side access panel and the metal side cover.
8.
Replace the password jumper.
9.
Replace the metal side cover and the side access panel.

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.
NOTE:
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 unit.
Table C-2
Power-On Diagnostic Test
Test
Boot Block Checksum
DRAM
Parallel Port
Serial Port
Timer
RTC CMOS battery
NAND flash device
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

Resetting the Administrator and power-on passwords

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