Quick Reference Guide

CHAPTER 13: Adding and Replacing Components
120
Preventing static electricity discharge
The components inside your computer are extremely sensitive to static electricity, also known
as electrostatic discharge (ESD).
Before opening the computer case, follow these guidelines:
• Turn off your computer.
• Wear a grounding wrist strap (available at most electronics stores) and attach it to a bare
metal part of your computer.
• Touch a bare metal surface on the back of the computer.
• Unplug the power cord and the modem and network cables.
Before working with computer components, follow these guidelines:
• Avoid static-causing surfaces such as carpeted floors, plastic, and packing foam.
• Remove components from their antistatic bags only when you are ready to use them. Do
not lay components on the outside of antistatic bags because only the inside of the bags
provide electrostatic protection.
• Always hold expansion cards by their edges or their metal mounting brackets. Avoid
touching the edge connectors and components on the cards. Never slide expansion cards
or components over any surface.
Warning
To avoid exposure to dangerous electrical voltages and moving parts, turn off your
computer and unplug the power cord and modem and network cables before opening
the case.
Caution
ESD can permanently damage electrostatic discharge-sensitive components in your
computer. Prevent ESD damage by following ESD guidelines every time you open the
computer case.
Warning
To prevent risk of electric shock, do not insert any object into the vent holes
of the power supply.