Dell OptiPlex 740 - Manual (Page 165)

6. From inside the computer cover, remove the mounting screw that secures the I/O panel to the computer.
7. Ease the I/O panel back and forth to release its circular tabs from the two holes in the chassis that secure it.
8. Remove any remaining cables; note the routing of all cables, so that you can reroute them
9. Remove the I/O panel from the computer.
Replacing the I/O Panel
1. To replace the I/O panel, follow the removal procedures in the reverse order.
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1 fan cable connector 2 air temperature sensor cable 3 I/O cable connector
4 screw 5 I/O panel
NOTE: Use the guides on the I/O panel bracket to help position the I/O panel in place and use the notch on the I/O panel bracket to help seat the card.