Dell OptiPlex GX50 Systems Service Manual page 63

5. Before lowering the retention arm, make sure of the following:
Tops of all expansion cards and filler brackets are flush with the alignment bar.
Notch in the top of the card or filler bracket fits around the alignment guide.
Press the arm into place, securing the expansion card(s) in the computer.
6. Connect any cables that should be attached to the card.
7. In the small desktop computer,
8. Reconnect the computer and devices to their electrical outlets and turn them on.
9. After you open and close the cover, the chassis intrusion detector causes the following message to be displayed at the
next computer start-up:
ALERT! Cover was previously removed.
See "Resetting the Chassis Intrusion
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replace the expansion-card
Detector" for instructions.
cage.