
vii
When Working Inside Your Computer
Before you remove the computer cover, perform the fol-
lowing steps in the sequence indicated:
1. Turn off your computer and any peripherals.
2. Disconnect your computer and peripherals from 
their power sources. Also, disconnect any 
telephone or telecommunication lines from the 
computer.
Doing so reduces the potential for personal injury or 
shock. 
3. Touch an unpainted metal surface on the chassis, 
such as the power supply at the back of the 
computer, before touching anything inside your 
computer. 
While you work, periodically touch an unpainted 
metal surface on the computer chassis to dissipate 
any static electricity that might harm internal 
components.
In addition, take note of these safety guidelines when 
appropriate:
•Do not attempt to service the computer system your-
self, except as explained in this guide and elsewhere 
in Dell documentation. Always follow installation 
and servicing instructions closely.
•When removing a component from the system board 
or disconnecting a peripheral device from the 
computer, wait 5 seconds after turning offthe system 
before removing the component or disconnecting the 
device to avoid possible damage to the system board.
•When you disconnect a cable, pull on its connector 
or on its strain-relief loop, not on the cable itself. 
Some cables have a connector with locking tabs; if 
you are disconnecting this type of cable, press in on 
the locking tabs before disconnecting the cable. As 
you pull connectors apart, keep them evenly aligned 
to avoid bending any connector pins. Also, before 
you connect a cable, make sure both connectors are 
correctly oriented and aligned. 
•Handle components and cardswith care. Don’t touch 
the components or contacts on a card. Hold a card by 
its edges or by its metal mounting bracket. Hold a 
component such as a microprocessor chip by its 
edges, not by its pins.
Protecting Against Electrostatic 
Discharge
Static electricity can harm delicate components inside 
your computer. To prevent static damage, discharge static 
electricity from your body before you touch any of your 
computer’s electronic components, such as the micro-
processor. You can do so by touching an unpainted metal 
surface on the computer chassis.
As you continue to work inside the computer, periodi-
cally touch an unpainted metal surface to remove any 
static charge your body may have accumulated.
In addition to the preceding precautions, you can also 
take the following steps to prevent damage from electro-
static discharge (ESD):
•When unpacking a static-sensitive component from 
its shipping carton, do not remove the component’s 
antistatic packing material until you are ready to 
install the component in your computer. Just before 
unwrapping the antistatic packaging, be sure to dis-
charge static electricity from your body.
•When transporting a sensitive component, first place 
it in an antistatic container or packaging.
•Handle all sensitive components in a static-safe area. 
If possible, use antistatic floor pads and workbench 
pads.
The following caution appears throughout this document 
to remind you of these precautions:
CAUTION: See “Protecting Against Electrostatic
Discharge” in the safety instructions at the front of
this guide.
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