Dell OptiPlex GX280 - Manual (Page 101)

1 release button
2 power supply
3 screws (4)
4 AC power connector
5. Slide the power supply toward the front of the computer approximately 1 inch.
6. Lift the power supply up and out of the computer.
7. Slide the replacement power supply into place.
8. Replace the screws that secure the power supply to the back of the computer frame.
9. Reconnect the DC power cables.
10. Connect the AC power cable to the connector.
11. Close the computer cover.
12. Attach the computer stand, if used.
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.
13. Connect your computer and devices to electrical outlets, and turn them on.
DC Power Connectors
Small Form-Factor Power Supply DC Connector Pin Assignments