Working Inside Your Computer; Before You Begin; Safety First-For You And Your Computer - Dell Precision 400 User Manual

Chapter 7

Working Inside Your Computer

Y
our Dell computer system supports a variety of in-
ternal options that expand system capabilities. This chap-
ter prepares you to install options inside the computer. It
describes how to remove and replace the computer cover
and expansion-card cage; it shows how to rotate the
power supply to gain access to system board features;
and it familiarizes you with the internal components you
may handle if you install Dell hardware options.
B
efore You Begin
To make working inside your computer easier, make sure
you have adequate lighting and a clean work space. If
you temporarily disconnect cables or remove expansion
cards, note the position of the connectors and slots so that
you can reassemble the system correctly.
You will use the information in this section every time
you install a hardware option inside your computer. Read
this section carefully, because the information is not
repeated in detail elsewhere in this guide.
Safety First For You and Your
—
Computer
Working inside your computer is safe—if you observe the
following precautions.
WARNING FOR YOUR PERSONAL SAFETY
AND PROTECTION OF YOUR EQUIPMENT
Before starting to work on your computer, perform
the following steps in the sequence indicated:
1. Turn off your computer and all 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. If you are disconnecting a peripheral from the
computer or are removing a component from
the system board, wait 5 seconds after turning
off the computer before disconnecting the
peripheral or removing the component to avoid
possible damage to the system board.
4. Touch an unpainted metal surface on the com-
puter chassis, such as the power supply, before
touching anything inside your computer.
While you work, periodically touch an
unpainted metal surface on the computer chas-
sis to dissipate any static electricity that might
harm internal components.
In addition, Dell recommends that you periodically
review the safety instructions at the front of this guide.
Working Inside Your Computer 7-1