The computer includes features that make it easy to upgrade and service. A Torx T15 or flat-bladed
screwdriver is needed for some of the installation procedures described in this chapter.
Warnings and cautions
Before performing upgrades be sure to carefully read all of the applicable instructions, cautions, and
warnings in this guide.
Disconnect the power cord from the AC outlet and allow the internal system components to cool before you
Do not plug telecommunications or telephone connectors into the network interface controller (NIC)
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 proper posture, health, and work habits for computer users. The Safety & Comfort Guide also provides
important electrical and mechanical safety information. The Safety & Comfort Guide is available on the Web
Disconnect power to the equipment before removing the enclosure.
Replace and secure the enclosure before re-energizing the equipment.
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.
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 on page 43
for more information.