Make sure to unplug ALL power cables from the system devices before removing the power supply module.
To remove the power supply module:
1.Loosen the thumbscrew that secures the power supply metal plate. Do not remove the thumb screw from the metal plate.
Thumbscrew
2.Hold the metal plate bar and push it downward to release the plate from the chassis. Remove the metal plate completely.
Metal plate bar 
3.Use one hand to push the power supply module from inside the power supply cage, then carefully pull out the module from the chassis.
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