Dell Precision 3260 Compact Service Manual page 53

Steps
1. Align the screw holes on the heat sink with the screw holes on the system board.
2. Tighten the three captive screws in a sequential order (1->2->3) to secure the heat sink to the system board.
3. Place the computer in an upright position.
Next steps
1. Install the processor fan.
2. Install the side cover.
Removing and installing components 53