Dell OptiPlex 5055 Small Form Factor Owner's Manual

Installing power supply unit — PSU

1. Insert the PSU into the slot.
2. Slide the PSU towards the back of the computer until it clicks into place.
3. Replace the screws( 6lbs) to secure the PSU to the computer.
4. Route the PSU cables through the retention clips.
5. Connect the PSU cables to the connectors on the system board.
6. Install the:
   1. optical drive
   2. cooling shroud
   3. 2.5 inch hard drive assembly
   4. front bezel
   5. cover
7. Follow the procedure in After working inside your computer.