Dell OptiPlex 7440 All-In-One W11C Owner's Manual page 40

4. To release the PSU:
•
NOTE: There is an additional cable retention clip on the side of the VESA mount bracket. The PSU near that is not
visible in the removing cables from retention clips image.
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].
40 Disassembly and reassembly