Dell E521 - Dimension Motherboard UW457 0UW457, Owner'S Manual

Page: 66 / 164

66
Removing and Installing Parts
Before Working Inside Your Computer
Use the following safety guidelines to help protect your computer from potential damage and to help
ensure your own personal safety.
CAUTION:
Before you begin any of the procedures in this section, follow the safety instructions in the Product
Information Guide .
CAUTION:
Handle components and cards with care. Do not 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 processor by its edges, not by its
pins.
NOTICE:
Only a certified service technician should perform repairs on your computer. Damage due to servicing
that is not authorized by Dell is not covered by your warranty.
NOTICE:
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 you disconnect the cable. As you pull connectors apart, keep them evenly aligned to avoid bending any
connector pins. Also, before you connect a cable, ensure that both connectors are correctly oriented and aligned.
NOTICE:
To avoid damaging the computer, perform the following steps before you begin working inside the
computer.
1
Turn off your computer (see "Turning Off Your Computer" on page 65).
NOTICE:
To disconnect a network cable, first unplug the cable from your computer and then unplug it from the
network device.
2
Disconnect any telephone or telecommunication lines from the computer.
3
Disconnect your computer and all attached devices from their electrical outlets, and then press the
power button to ground the system board.
CAUTION:
To guard against electrical shock, always unplug your computer from the electrical outlet before
removing the cover.
4
Remove the computer cover (see "Removing the Computer Cover" on page 66).
NOTICE:
Before touching anything inside your computer, ground yourself by touching an unpainted metal surface,
such as the metal at the back of the computer. While you work, periodically touch an unpainted metal surface to
dissipate any static electricity that could harm internal components.
Removing the Computer Cover
CAUTION:
Before you begin any of the procedures in this section, follow the safety instructions in the Product
Information Guide .
CAUTION:
To guard against electrical shock, always unplug your computer from the electrical outlet before
removing the cover.
1
Follow the procedures in "Before You Begin" on page 65.
NOTICE:
Ensure that sufficient space exists to support the removed cover.