Dell XPS 8920 Service Manual page 42

Figure 19. Rotating the power-supply unit
1. power-supply unit cage release latches (2)
3. chassis
3. Disconnect the CPU-power cable and system board power cable from the system board and the optical-drive power cable from the
optical drive.
For more information, see
4. Disconnect the graphics-card power cables if applicable.
5. Remove the system-board power cable from the routing guide on the chassis.
42 Removing the power-supply unit
"System-board components".
2. power-supply unit
4. power-supply unit cage