Dell XPS M2010 Service Manual page 89

1 screws (4)
8. Remove the four screws that attach the power supply to the back of the computer chassis.
9. Gather the power supply bundles that stem from the power supply, for easy removal.
1 power supply screws (4)
10. Slide the power supply towards the front of the computer to free it from the securing tabs on the computer chassis.
11. Slide the power supply toward the hard-drive bay area, so that it will clear the protruding lip of the chassis and lift the power supply from the computer.
Installing the Power Supply
2 hard-drive bays