Dell Precision 340 - Manual (Page 53)

2. Disconnect the AC power cable from the back of the power supply.
3. Disconnect the DC power cables from the system board and the drives.
Note the routing of the DC power cables underneath the clips in the computer as you remove them from the system board and drives. It is important to
route these cables properly when you replace them to prevent them from being pinched or crimped.
4. On the small desktop computer, remove the expansion-card cage and remove the power cables from the side of the hard drive. To remove the power
cables, use the cables as leverage and pull away from the clips while simultaneously pulling on the metal clips with your fingers.
5. On the mini-tower computer, remove the two screws that secure the power supply.
6. Press the push button.
7. Slide the power supply toward the front of the computer approximately 1 inch.
8. Lift the power supply up and out of the computer.
Replacing the Power Supply
1. Slide the power supply into place.
2. Reconnect the DC power cables.
3. Connect the AC power cable to the connector.
4. On the small desktop computer, reattach the power cables to the side of the hard drive and replace the expansion-card cage .
5. Run the cables underneath the clips.
6. Press the clips to close them over the cables.
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2 push button