HP Z420 HP Z420, Z620, and Z820 Workstation Series User Guide - Page 42
Locating ID labels
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Locating ID labels To assist in troubleshooting, product, serial, and authentication numbers are available on each computer. ● All workstations have a serial number (unique for each workstation) and product number. Have these numbers available when you contact support. ● The Certificate of Authentication (COA) is used for Windows-preinstalled systems only. ● A Service label shows the Build ID and FeatureByte strings, which are needed for system board replacement. In general, these labels can be found in these locations (your computer may look different): ● On the top, rear or bottom of the chassis (tower and desktop configuration) ● On a pull-out card on the side of the display (all-in-one configuration) Figure 6-1 Tower and desktop label locations Figure 6-2 All-in-one label locations 34 Chapter 6 Diagnostics and Minor Troubleshooting