Dell Inspiron 545s (Early 2009) - Manual (Page 27)

Replacing the Chassis Fan
1. Follow the procedures in Before You Begin .
2. Align the top and bottom chassis fan tabs with the projections in the chassis, and slide the chassis fan towards the back of the computer.
3. Replace the screw that secures the chassis fan.
4. Connect the chassis fan cable to the chassis fan connector on the system board (see System Board Components ).
5. Replace the computer cover (see Replacing the Computer Cover ).
6. Connect your computer and devices to an electrical outlet, and turn them on.
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1 screw 2 chassis fan
1 bottom tab 2 top tabs (2) 3 screw