Dell OptiPlex NX1 - Manual (Page 147)

Removing and Replacing Parts on the OptiPlex NX1 Net PC Chassis 7-5
To remove the computer cover, follow these steps:
1. Remove the padlock, if one is installed, from the padlock ring.
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2. Using a #2 Phillips screwdriver, rotate the service access lock 1/4 -turn
clockwise to the position shown in Figure 7-4.
3. Press the two securing buttons until the cover is free to swing up.
4. Raise the back of the cover, and pivot it toward the front of the computer.
5. Lift the cover off the hooks at the front of the chassis.
Four plastic hooks at the front of the cover secure it to the chassis.
Before you reinstall the cover, fold all cables out of the way so that they do not
interfere with the cover or with proper airflow inside the computer. You may
have to press gently downward on the back edge of the cover while engaging
the locking mechanism.
security cable slot
service access lock
padlock ring