Dell XPS 8500 (Early 2012) - Manual (Page 111)

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Power-Supply Unit
WARNING: Before working inside your computer, read the safety information
that shipped with your computer and follow the steps in "Before You Begin" on
page 13. For additional safety best practices information, see the Regulatory
Compliance Homepage at dell.com/regulatory_compliance.
Prerequisites
1 Remove the computer cover. See "Removing the Computer Cover" on
page 23.
Removing the Power-Supply Unit
1 Disconnect the DC power cables from the system board and the drives.
See "System-Board Components" on page 21.
2 Remove the screws that secure the power supply to the chassis.
3 Press the power supply clamps to release the power supply from the
chassis.
4 Slide and lift the power supply away from the chassis.
Power-Supply Unit 111