Dell Inspiron 580s Service Manual page 33

WARNING: Failure to replace and tighten all screws may cause electrical shock as these screws are a key part of the system grounding.
3. Replace the three screws that secure the power supply to the computer chassis.
NOTE: Route the DC power cables under the chassis tabs. The cables must be properly routed to prevent the cables from being damaged.
4. Connect the DC power cables to the system board and drives.
5. Secure all the cables to the securing clip on the side of the power supply.
NOTE: Double-check all cable connections to make sure they are secure.
6. Replace the support bracket (see
7. Replace the computer cover (see
8. Connect your computer and devices to electrical outlets, and turn them on.
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Replacing the Support Bracket).
Replacing the Computer Cover).