3
Hardware upgrades
Serviceability features
The computer includes features that make it easy to upgrade and service.
Warnings and cautions
Before performing upgrades, be sure to carefully read all of the applicable instructions, cautions, and
warnings in this guide.
WARNING!
To reduce the risk of personal injury from electric shock, hot surfaces, or fire:
Disconnect the power cord from the AC outlet before removing the enclosure. Energized and moving 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 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. 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
CAUTION:
Static electricity can damage the electrical components of the computer or optional equipment.
Before beginning these procedures, ensure that you are discharged of static electricity by briefly touching a
grounded metal object. See
Electrostatic discharge on page 25
for more information.
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.
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Chapter 3 Hardware upgrades