Dell XPS 420 (Late 2007) - Manual (Page 166)

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Removing and Installing Parts
5 Press and hold the metal release tab at the bottom of the power supply
unit, push the power supply towards the front of the computer to free it
from the securing tabs on the computer chassis.
6 Gather the power supply bundles that stem from the power supply, for easy
removal and lift it out of the computer.
Installing the Power Supply
1 Seat the power supply unit into place, ensuring that the slot bottom of
unit is aligned to tabs on the chassis, then slide it towards the back of the
system till it snaps into place.
2 Replace the four screws that secure the power supply to the back of the
computer chassis.
3 Reattach each of the DC power cables that were previously connected,
carefully rerouting them as you found them.
1 power supply screws (4)
1
book.book Page 166 Tuesday, November 27, 2007 10:29 AM