Dell Inpsiron 560s (Late 2009) - Manual (Page 32)

3. Replace the three screws that secure the power supply to the computer chassis.
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.
6. Replace the support bracket (see Replacing the Support Bracket ).
7. Replace the computer cover (see Replacing the Computer Cover ).
8. Connect your computer and devices to electrical outlets, and turn them on.
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WARNING: Failure to replace and tighten all screws may cause electrical shock as these screws are a key part of the system grounding.
NOTE: 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.