Dell OptiPlex GX1 - Expansion-Card Cage; Riser Board

Removing and Replacing Parts on the Midsize Chassis 5-15
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The computer has a removable expansion-card cage. The expansion-card cage
contains the riser board and any installed expansion cards. Dell recommends
that you remove the expansion-card cage first before removing or installing
expansion cards.
If you are not removing any expansion cards, leave the external cables
attached to them.
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To remove an expansion-card cage, follow these steps:
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To replace an expansion-card cage, keep the cage flush against the chassis to
ensure that the lever engages the notch when the lever is depressed.
lever
expansion-
card cage
notch