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

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Plug the monitor into a different video port on the computer if one is available. Alternatively,
replace the monitor with a monitor that you know is working properly.
◦
Verify that the computer
and monitor are plugged into a working electrical outlet.
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Verify that the monitor is turned on and the green monitor light is on.
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Turn up the brightness and contrast controls of the monitor if the monitor is dim.
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If the internal display on an all-in-one computer is blank, open the computer and make sure the
graphics card is properly installed.
●
Upgrade the BIOS. A new release of the BIOS might have been released that supports new
features or fixes your problem.
Customer Self-Repair program
Under the Customer Self-Repair program, you can order a replacement part and install the part
without onsite HP technical assistance. Customer self-repair may be required for some components.
See
http://www.hp.com/go/selfrepair for information on the program.
NOTE: Some components are not eligible for customer self-repair and must be returned to HP for
service. Call HP Support for further instructions before attempting to remove or repair these
components.
HP troubleshooting resources and tools 121