Installing the power supply unit or PSU1. Insert the PSU in the chassis and slide it towards the back of the system to secure it [1, 2].2. Route the system power cable through the retention clips [3].3. Connect the power cable to the connector on the system board [4].4. Replace the screws to secure the PSU to the rear chassis of the system [5].56 Removing and installing components

Dell OptiPlex 7070 Service Manual