Replacing the power-supply unit
WARNING: Before working inside your computer, read the safety 
information that shipped with your computer and follow the steps in Before 
working inside your computer. After working inside your computer, follow 
the instructions in After working inside your computer. For more safety best 
practices, see the Regulatory Compliance home page at 
www.dell.com/
regulatory_compliance.
 
Procedure
1  Align the screw holes on the power-supply unit with the screw holes on the 
middle cover.
2  Replace the five screws (M3X4) that secure the power-supply unit to the middle 
cover.
3  Route the cables through the guide and close the clip to secure the cables.
4  Connect the power-supply indicator cable and power-supply fan cable to their 
respective connectors.
5  Route the power-supply unit cable through the routing guides on chassis fan.
6  Connect the power-supply unit cable to its connector on the system board.
Post-requisites
1  Replace the stand.
2  Replace the back cover.
3  Replace the USB dongle-bay cover.
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