Dell Alienware Aurora R8 Service Manual page 47

7 Disconnect the processor-power cable and system-board power cable from the system board.
8 Rotate the power-supply unit cage towards the chassis until the unit snaps into place.
9 Remove the two screws (#6-32 X 1/4") that secure the power-supply unit bracket to the power-supply unit cage.
10 Lift the power-supply unit bracket off the power-supply unit cage.
11 Remove the four screws (#6-32 X 1/4") that secure the power-supply unit to the chassis.
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