Dell OptiPlex 330 (Late 2007) - Manual (Page 92)

5. Remove the two screws that attach the power supply to the back of the computer chassis.
6. Press the release button located on the floor of the computer chassis.
7. Remove the optical drive and carefully set it aside (see Optical Drive ).
8. Slide the power supply toward the front of the computer by approximately 1 inch.
9. Lift the power supply up and out of the computer.
10. Slide the replacement power supply into place.
11. Replace the screws that secure the power supply to the back of the computer chassis.
12. Reconnect the DC power cables to the system board and drives.
13. Secure the hard drive cable, CD or DVD drive data cable, and the front panel ribbon cable to the securing clip on the side of the power supply.
14. Replace the computer cover (see Replacing the Computer Cover ).
15. Ensure that the correct power supply voltage (115 V or 230 V) is selected, using the red voltage selection switch at the back of the chassis.
16. Connect your computer and devices to an electrical outlet, and turn them on.
17. Verify that the computer works correctly by running the Dell Diagnostics (see Dell Diagnostics ).
Speakers
1 release button 2 power supply
3 screws (2) 4 voltage selection switch (red)
5 AC power connector
CAUTION: Failure to replace and tighten all screws may cause electrical shock as these screws are a key part of the system grounding.
NOTICE: Route the DC power cables under the chassis tabs. The cables must be properly routed to prevent the cables from being damaged.
NOTE: Double-check all cable connections to make sure they are secure.
NOTICE: To connect a network cable, first plug the cable into the network device and then plug it into the computer.