Setup and Quick Reference Guide 17
3At the Dell Support website home page, click Reference, click User’s
Guides, click Systems, and then select your Dell Precision computer.
Opening the Computer Cover CAUTION: Before you begin any of the procedures in this section,
follow the safety instructions in the System Information Guide.
1Shut down the computer through the Start menu.
2Ensure that your computer and attached devices are turned off. If your
computer and attached devices did not automatically turn off when
you shut down your computer, turn them off now.
NOTICE: To disconnect a network cable, first unplug the cable from your
computer and then unplug it from the network wall jack.
3Disconnect any telephone or telecommunication lines from the
computer.
4Disconnect your computer and all attached devices from electrical
outlets, and then press the power button to ground the system board.
5If you have installed a padlock through the padlock ring on the back
panel, remove the padlock.
CAUTION: To guard against electrical shock, always unplug your
computer from the electrical outlet before opening the cover.
6Lay the computer on its side as shown in the illustration.
NOTICE: Ensure that sufficient space exists to support the open cover—at
least 30 cm (1 ft) of desktop space.
7Open the computer cover:
aFacing the back of the computer, press the release button on the
right side of the computer with one hand while pulling up on the
top of the cover with the other hand.
bPress the release button on the left side of the computer with one
hand while pulling up on the top of the cover with the other hand.
cHold the bottom of the computer with one hand, and then pull
open the cover with the other hand.