Dell OptiPlex 7490 All-In-One - Installing the power-supply unit (PSU)

Steps
1. Remove the screw (M3x5) that secures the power-supply socket to the rear-I/O bracket.
2. Slide the power-supply socket out of the rear-I/O bracket.
3. Remove the power-supply cable from the routing guides on the rear-I/O bracket and PSU fan.
4. Disconnect the power-supply cable from the connector on the system board.
5. Remove the screw (M3x5) that secures the PSU to the display-assembly base.
6. Lift the PSU out of the system.
Installing the power-supply unit (PSU)
Prerequisites
If you are replacing a component, remove the existing component before performing the installation procedure.
About this task
The following image indicates the location of the PSU and provides a visual representation of the PSU installation procedure.
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Removing and installing components