Dell OptiPlex 7440 - Power Supply Unit (PSU) Installation

Removing the Power Supply Unit (PSU)
1. Follow the procedure in Before Working Inside Your Computer.
2. Remove the:
a. stand
b. back cover
c. cable cover
d. speaker cover
e. system-board shield
3. Perform the following steps as shown in the illustration:
a. Unthread the power-supply cables from the retention clips in the chassis [1].
b. Disconnect the power-supply cable from the connector on the system board [2].
4. Perform the following steps as shown in the illustration:
a. Remove the screw that secures the power-supply socket to the chassis [1].
b. Slide the socket to remove it from the computer [2].
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