Dell 23.8" OptiPlex 7410 All-in-One Desktop Computer (Gray) - Manual (Page 75)

3. Disconnect the system-board power cable (ATX SYS) from the system board.
4. Remove the three screws (M3x5) that secure the power-supply unit to the display-assembly base.
5. Remove the two screws (M3x5) that secure the power-supply connector cable bracket to the display-assembly base.
6. Lift the power-supply unit, its cables, and the power-supply unit connector off the display-assembly base.
Installing the power-supply unit
Prerequisites
If you are replacing a component, remove the existing component before performing the installation process.
About this task
The following image(s) indicate the location of the power-supply unit and provides a visual representation of the installation
procedure.
Steps
1. Place the power-supply unit and the power-supply unit connector on the display-assembly base.
2. Align the screw holes on the power-supply unit with the screw holes on the display-assembly base.
3. Replace the three screws (M3x5) that secure the power-supply unit to the display-assembly base.
Removing and installing Customer Replaceable Units (CRUs) 75