Dell OptiPlex GX1p - Manual (Page 109)

Removing and Replacing Parts on the Midsize Chassis 5-17
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To remove the riser board, follow these steps:
1. Remove the expansion-card cage and all expansion cards.
2. On a flat work surface, turn the expansion-card cage over, with the riser
board facing up.
3. Remove the riser-board mounting screws.
4. Slide the riser board down 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)