Dell Dimension 4400 - Manual (Page 9)

7. Pull the arms toward you until they snap into place.
If the hinge arms don't snap back into place on the first attempt, slightly reposition the arms and try again.
8. After the hinge arms clip into place, lower and raise the arms two or three times to properly seat them.
9. Reattach the front-panel insert.
10. Reconnect the power cable to your computer.
11. Reattach the front door as described in " Reattaching the Front Door ."
Opening the Computer Cover
1. Shut down the computer .
2. Turn off any attached devices and disconnect them from their electrical outlets.
3. Disconnect the computer power cable from the wall outlet, and then press the power button to ground the system board.
4. Lay the computer on its side so that the arrow on the bottom of the computer points up.
5. Locate the two release buttons shown in the illustration.Then, press the two release buttons as you lift the cover.
NOTICE: Using excessive force to pull the hinge arms into place may damage the arms or the front panel.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in " Safety Instructions ."
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then unplug it from the network wall jack.
NOTICE: Ensure that there is sufficient space to support the open cover—at least 30 cm (1 ft) of desk top space.