Dell OptiPlex NX1 - Manual (Page 121)

Removing and Replacing Parts on the Mini Tower Chassis 6-5
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To remove the front bezel, follow these steps:
1. Press the tab release marked with the icon.
2. Tilt the bezel away from the chassis.
3. Disengage the two retaining hooks at the bottom of the bezel, and pull the
bezel away from the chassis.
tab release
retaining hooks (2)