Dell Vostro 3250 Owner's Manual page 21

Figure 13.
4. Follow the steps to release the I/O panel:
a. Remove the screw that secures the I/O panel to the chassis [1].
b. Press the tab to release the I/O panel from the chassis [2].
c. Pull the I/O panel to release the I/O panel.
Figure 14.
5. Follow the steps to remove the system board:
a. Remove the screws that secure system board to the chassis [1].
b. Lift the system board from the chassis.
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