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3
Hardware repair and upgrade
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 before removing the enclosure. Energized parts are inside.
Allow the internal system components to cool before you touch them.
Replace and secure the enclosure before restoring power to the equipment.
Do not connect telecommunications or telephone connectors to 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 in a grounded (earthed) AC outlet that is easily accessible at all times.
For your safety, do not place anything on power cords or cables. Arrange them so that no one may
accidentally step on or trip over them. Do not pull on a cord or cable. When unplugging from the AC outlet,
grasp the cord by the plug.
To reduce the risk of serious injury, read the Safety & Comfort Guide. It describes proper workstation setup
and provides guidelines for posture and work habits that increase your comfort and decrease your risk of
injury. It also provides electrical and mechanical safety information. This guide is located on the web at
http://www.hp.com/ergo.
CAUTION:
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. You
must disconnect the power cord from the power source before opening the computer to prevent damage to
internal components.
Additional information
For more information on removing and replacing hardware components, the Computer Setup utility, and
troubleshooting, refer to the Maintenance and Service Guide (available in English only) for your computer
model at http://www.hp.com.
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Chapter 3 Hardware repair and upgrade
To reduce the risk of personal injury from electrical shock, hot surfaces, or fire:
Static electricity can damage the electrical components of the computer or optional equipment.
Electrostatic discharge on page 43
for more information.
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