Dell OptiPlex 9010 All In One (Mid 2012) - Manual (Page 25)

Removing the Power Supply Unit (PSU)
1. Follow the procedures in Before Working Inside Your Computer .
2. Remove the:
a) VESA stand
b) back cover
c) VESA mount bracket
d) system-board shield
e) input/output board shield
f) power-supply fan
3. Press the tab and disconnect the power-supply cable from the connector on the system board. Unthread the cable
from the hooks in the computer.
4. Remove the screws securing the power supply unit to the chassis. Lift the PSU up and remove it from the computer.
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