1. Follow the procedures in Before Working Inside Your Computer:
Ensure that your work surface is flat and clean to prevent the computer cover from being scratched.
Turn off your computer (see Turning Off Your Computer).
CAUTION: To disconnect a network cable, first unplug the cable from your computer and then unplug the cable from the network device.
Disconnect all network cables from the computer.
Disconnect your computer and all attached devices from their electrical outlets.
Press and hold the power button while the computer is unplugged to ground the system board.
2. Remove the cover.
3. Remove the front bezel.
4. Remove the drive cage.
5. Remove the fan shelter.
6. Disconnect the 4-pin power cable from the system board.
7. Unthread the 4–pin power cable from the chassis clips.
8. Disconnect the 24-pin power cable from the system board.
9. Remove the screws that secure the power supply, from the back of the computer.
10. Push in on the blue release tab beside the power supply, and slide the power supply towards the front of the computer.
11. Lift the power supply out of the computer.
Installing The Power Supply
1. Place the power supply in the chassis and slide outward to secure it.
2. Tighten the three screws securing the power supply to the back of the
computer.
3. Connect the power cable to the system board.
4. Thread the power cable into the chassis clips.
5. Connect the power cable to the system board.
6. Install the fan shelter.
7. Install the drive cage.
8. Install the front bezel.
9. Install the cover.
10. Follow the procedures in After Working Inside Your Computer:
Connect any telephone or network cables to your computer.
Connect your computer and all attached devices to their electrical outlets.
Turn on your computer.
Verify that the computer works correctly by running the Dell Diagnostics.
