Dell XPS 8920 Service Manual page 43

Figure 20. Disconnecting cables
1. optical drive power cable
3. CPU power cable
5. system board power cable
6. Rotate the power-supply unit cage towards the chassis.
7. Disconnect the hard-disk power cable.
NOTE: There could be up to three hard-disk power cables depending on the quantity of hard-disk drive installed.
8. Remove the screws that secure the power-supply bracket to the chassis.
9. Remove the screws that secure the power-supply unit to the chassis.
10. Lift the power-supply bracket off the chassis.
11. Lift the power-supply unit off the chassis.
2. routing guide
4. system board
Removing the power-supply unit 43