Dell Inspiron 580 (Late 2009) - Manual (Page 30)

3. Replace the four screws that secure the power supply to the back of the 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 computer cover (see Replacing the Computer Cover ).
7. Connect your computer and devices to electrical outlets, and turn them on.
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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.
CAUTION: To help avoid damaging your computer, ensure that the voltage selector switch is set for the voltage that most closely matches the AC
power available in your location.