Dell XPS /Dimension Owner's Manual page 118

If you are using a padlock to secure your computer, install the padlock.
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NOTICE: To connect a network cable, first plug the cable into the network wall jack and then
plug it into the computer.
Connect your computer and devices to electrical outlets, and turn them on.
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118 Re m ov i n g a n d I ns t al l i n g Pa r t s