Dell OptiPlex NX1 - Manual (Page 151)

Removing and Replacing Parts on the OptiPlex NX1 Net PC Chassis 7-9
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The computer has a removable expansion-card cage. The expansion-card cage
contains the hard-disk drive, the riser board, and any installed expansion card.
You must remove the expansion-card cage to remove or install the hard-disk
drive, an expansion card, or the riser board.
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To remove the expansion-card cage, follow these steps:
1. Disconnect any external cables from the expansion card if one is installed.
2. Disconnect the DC power cable and the EIDE cable from the back of the
hard-disk drive.
3. Rotate the securing lever toward the back of the computer until it stops in
the upright position.
4. Lift the expansion-card cage up and away from the computer.
To replace an expansion-card cage, keep it flush against the left side of the
chassis to ensure that the two cage slots engage the tabs on the left side of
the computer. Press gently downward on the back-right corner of the
expansion-card cage while rotating the securing lever forward.
securing
lever
expansion-card cage
tabs (2)
slots (2)
DC
power
cable
EIDE cable