Dell Inspiron 3910 Service Manual page 40

Steps
1. Place the computer on its side with the left side facing up.
2. Disconnect the graphics-card power cable from the graphics card.
3. Press the securing clip and disconnect the processor-power cable from the system board.
4. Press the securing clip and disconnect the system-board power cable from the system board.
5. Remove the power-supply unit cables from the routing guides on the chassis.
6. Remove the three screws (#6-32) that secure the power-supply unit to the chassis.
7. Slide and lift the power-supply unit off the chassis.
40 Removing and installing components