Dell OptiPlex 7020 (Mid 2014) - Manual (Page 18)

3. Disconnect the 4-pin and 8-in power cables from the system board and release the cable from the
tab.
4. Remove the screws that secure the power supply to the back of the computer.
5. Push in on the blue release tab beside the power supply, and slide the power supply towards the
front of the computer. Lift and remove the power supply out of the computer.
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