HP Z220 SFF, Z220 CMT, Z420, Z620, and Z820 Workstations Maintenance and Service Guide

Troubleshooting checklist
Before running diagnostic utilities, make sure that.
●
The computer is connected to a working electrical outlet and powered on, and the power light is
illuminated.
●
The monitor (for tower or desktop configurations) is connected to a working electrical outlet and
powered on, and the power light is illuminated.
●
The monitor brightness and contrast are properly adjusted.
●
The keyboard is operating correctly (press and hold any key and listen for a beep).
●
All cables are properly connected.
●
All necessary device drivers are installed
●
All external media (such as optical disks or USB drive keys) are removed before startup.
●
The latest version of BIOS, drivers, and software are installed.
Troubleshooting checklist 117