Dell Alienware Area-51 Service Manual page 77

Figure 26. Removing the power-supply unit
a. power cable
b. power-supply unit
c. screws (4)
4. Lift the power-supply unit cover away from the chassis.
Figure 27. Removing the power-supply unit
a. power-supply unit
b. power-supply unit cover
5. Slide the power-supply unit out through the back of the chassis and remove it from the computer.
Removing the power-supply unit 77