Dell P80G Service Manual page 64

Steps
1 Locate the heatsink slot on your computer.
2 Align and place the heatsink fan on to the heatsink assembly.
3 Install the single (M2x5) screw that secures the heatsink fan to the heatsink assembly.
4 Align and place the heatsink assembly into the slot of your computer.
5 Install the two (M2x5) and four (M2x3) captive screws to secure the heatsink assembly to the computer.
NOTE: Install the screws as per the callout on the heatsink.
6 Connect the heatsink fan cable on to the connector on the system board.
Next step
1 Install the battery.
2 Install the base cover.
3 Follow the procedure in
64 Disassembly and reassembly
After working inside your computer.