Dell OptiPlex GX1p - Manual (Page 135)

Removing and Replacing Parts on the Mini Tower Chassis 6-19
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To remove the riser board, follow these steps:
1. Remove the expansion-card cage and all expansion cards.
2. Place the expansion-card cage on a flat work surface with the riser board
facing up.
3. Remove the riser-board mounting screws.
4. Slide the riser board away from the release handle until it stops; then lift
the riser board away from the expansion-card cage.
riser board riser-board
mounting screws (2)
expansion-card cage
slots (2)