Dell OptiPlex 7490 All-In-One - Power-supply unit (PSU); Removing the power-supply unit (PSU)

Steps
1. Align the screw holes on the bottom cover with the screw holes on the display-assembly base.
2. Replace the four screws (M3x5) to secure the bottom cover to the display-assembly base.
Next steps
1. Install the system-board shield.
2. Install the back cover.
3. Install the cable cover (optional).
4. Install the stand.
5. Follow the procedure in After working inside your computer.
Power-supply unit
Removing the power-supply unit (PSU)
Prerequisites
1. Follow the procedure in Before working inside your computer.
2. Remove the stand.
3. Remove the cable cover (optional).
4. Remove the back cover.
5. Remove the system-board shield.
6. Remove the bottom cover.
About this task
The following image indicates the location of the PSU and provides a visual representation of the PSU removal procedure.
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Removing and installing components