Dell OptiPlex 755 User Manual page 80

6 Slide the power supply toward the front of the computer by approximately 1 inch.
7 Lift the power supply up and out of the computer.
8 Slide the replacement power supply into place.
9 Replace the screws that secure the power supply to the back of the computer chassis.
10 Reconnect the DC power cables to the power supply.
11 Connect the AC power cable to the AC power connector.
12 Replace the computer cover (see "Replacing the Computer Cover" on page 317).
80
Power Supply
1
1 release button
3 screws (4)
2 3
2 power supply
4 AC power connector
4