Dell OptiPlex GX520 - Manual (Page 18)

18
Quick Reference Guide
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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.
Before You Begin
NOTICE:
To avoid losing data, save and close any open files and exit any open programs before you turn
off your computer.
1 Shut down the operating system:
a Save and close any open files, exit any open programs, click the Start button, and then
click Turn Off Computer.
b In the Turn off computer window, click Turn off.
The computer turns off after the operating system shutdown process is complete.
2 Ensure that the computer and any attached devices are turned off. If your computer and
attached devices did not automatically turn off when you shut down your operating system,
turn them off now.
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.
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.
To avoid damaging the computer, perform the following steps before you begin working inside
the computer.
1 Turn off your computer if it is not already turned off.
NOTICE:
To disconnect a network cable, first unplug the cable from your computer and then unplug it
from the network wall jack.
2 Disconnect any telephone or telecommunication lines from the computer.