Dell OptiPlex NX1 - Manual (Page 124)

6-8 Dell OptiPlex GX1/GX1p Managed PC and OptiPlex NX1 Net PC Systems Service Manual
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To remove a 3.5-inch front-panel insert, follow these steps:
1. Hold the bezel with the front facing you.
2. Inside the bezel, press the eject button mechanism toward the front panel
to snap the plastic insert out of its opening.
To replace the 3.5-inch front-panel insert, work from outside the bezel. Place
the insert in position, and press it into the opening.
front of bezel
back of bezel
eject button mechanism