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Removal And Replacement Procedures; Warnings And Cautions - HP ProDesk 400 G4 Maintenance And Service Manual

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Removal and replacement procedures

Adherence to the procedures and precautions described in this chapter is essential for proper service. After
completing all necessary removal and replacement procedures, run the Diagnostics utility to verify that all
components operate properly.
NOTE:
Not all features listed in this guide are available on all computers.
NOTE:
HP continually improves and changes product parts. For complete and current information on
supported parts for your computer, go to http://partsurfer.hp.com, select your country or region, and then
follow the on-screen instructions.

Warnings and cautions

Before performing upgrades be sure to carefully read all of the applicable instructions, cautions, and
warnings in this guide.
WARNING!
Disconnect the power cord from the AC outlet and allow the internal system components to cool before you
touch them.
Do not plug telecommunications or telephone connectors into the network interface controller (NIC)
receptacles.
Do not disable the power cord grounding plug. The grounding plug is an important safety feature.
Plug the power cord into a grounded (earthed) AC outlet that is easily accessible at all times.
To reduce the risk of serious injury, read the Safety & Comfort Guide. The Safety & Comfort Guide also
provides important electrical and mechanical safety information. The Safety & Comfort Guide is available on
the web at http://www.hp.com/ergo.
WARNING!
Disconnect power to the equipment before removing the enclosure.
Replace and secure the enclosure before re-energizing the equipment.
IMPORTANT:
equipment. Before beginning these procedures, ensure that you are discharged of static electricity by briefly
touching a grounded metal object. See
When the computer is plugged into an AC power source, voltage is always applied to the system board. To
prevent damage to internal components, you must disconnect the power cord from the power source before
opening the computer.
NOTE:
Your computer model may look slightly different from the illustrations in this chapter.
14
Chapter 4 Removal and replacement procedures
To reduce the risk of personal injury from electrical shock, hot surfaces, or fire:
Energized and moving parts inside.
Static electricity can damage the electrical components of the computer or optional
Electrostatic discharge information on page 8
for more information.

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