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2-2 Dell Dimension 900 System Reference and Troubleshooting Guide
Installation Guidelines
Keep a static-sensitive component in its antistatic packing material until you are ready
to install the component in the computer. Just before unwrapping the antistatic pack-
aging, discharge static electricity from your body.
Make sure you have adequate lighting and a clean work space. If you temporarily dis-
connect cables or remove expansion cards, note the position of the connectors and
slots so that you can reassemble the system correctly. Also note the extra connectors
available for upgrades.
Removing and Replacing the Computer
Cover
To remove the computer cover, perform the following steps:
1. Observe the “Caution for Your Personal Safety and Protection of Your Equip-
ment” found earlier in this chapter. Also, observe the safety instructions at the
front of this guide.
NOTICE: To avoid inadvertently damaging the system board, be sure that
you disconnect the computer’s power cable from the electrical outlet and
from the back of the chassis before removing the computer cover. The sys-
tem board continues to receive a small amount of power when the system
is turned off and attached to an electrical outlet (the system-board power
indicator [see Figure 2-4] is on when power is detected).
2. Lift the computer out of its stand.
3. Place the computer in a horizontal position (see Figure 2-1).
4. If you have installed a padlock through the padlock ring on the back panel, remove
the padlock.
5. Remove the three screws that secure the cover to the back panel (see
Figure 2-1).