Dell Inspirion 3656 Service Manual page 53

a. securing clips (2)
b. routing guides
c. power cable
4. Remove the screws that secure the power-supply unit to the chassis.
5. Press the clamp and release the power-supply unit from the chassis.
6. Slide and lift the power-supply unit off the chassis.
1. clamp
3. power-supply unit
2. power cables
4. screws (3)
Removing the power-supply unit 53