2 Hardware upgrades
Warnings and cautions
Before performing upgrades, be sure to carefully read all of the applicable instructions, cautions, and
warnings.
WARNING! To reduce the risk of personal injury from electric shock, hot surfaces, or re:
Unplug the power cord from the AC outlet and allow the internal system components to cool before you touch
them.
Do not disable the power cord grounding plug. The grounding plug is an important safety feature.
Plug the power cord into a grounded (earthed) outlet that is easily accessible at all times.
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. The Safety & Comfort Guide is located on
the HP website at
http://www.hp.com/ergo.
WARNING! Energized and moving parts inside.
Disconnect power to the equipment before removing the access panel.
Replace and secure the access panel before re-energizing the equipment.
IMPORTANT: Static electricity can damage the electrical components of the computer or optional
equipment. Before beginning the following procedures, ensure that you are discharged of static electricity by
briey touching a grounded metal object. See Electrostatic discharge on page 33 for more information.
Preparing for disassembly
Use the following disassembly steps as necessary, depending on whether you are installing new components
or replacing existing components.
1. Remove all removable media, such as a USB ash drive, from the computer.
2. Turn o the computer properly through the operating system, and turn o any external devices.
3. Unplug the power cord from the AC outlet and disconnect any external devices.
IMPORTANT: 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 unplug the power cord from the
power source before opening the computer.
8 Chapter 2 Hardware upgrades
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