Dell Inspiron 535 (Early 2009) - Manual (Page 30)

6. While pressing down on the power supply retention snap(s), slide out the power supply and lift it out.
Replacing the Power Supply
1. Press down on the power supply retention snap(s) and slide the replacement power supply towards the back of the computer.
2. Replace the four screws that secure the power supply to the back of the computer chassis.
3. Connect the DC power cables to the system board and drives.
4. Secure all the cables to the securing clip on the side of the power supply.
5. Replace the computer cover (see Replacing the Computer Cover ).
6. Check the voltage selector switch (if applicable) to ensure that the correct voltage is selected.
7. Connect your computer and devices to an electrical outlet, and turn them on.
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1 screws (4) 2 power supply
3 voltage selector switch 4 power supply retention snaps (2)
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.