Dell 900 manual Installation Guidelines, Removing and Replacing the Computer Cover

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).

2-2 Dell Dimension 900 System Reference and Troubleshooting Guide