Dell Vostro 1200 (Early 2009) - Manual (Page 11)

Replacing the Processor Thermal-Cooling Assembly
1. Place the processor thermal-cooling assembly over the processor.
2. Tighten the four spring screws, labeled "1" through "4," in consecutive order.
3. Replace the battery (see Replacing the Battery ).
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1 processor thermal-cooling assembly 2 screws (4)
NOTE: If you are replacing the thermal-cooling assembly without removing and replacing a new processor, you can place the new thermal pad directly
on any existing thermal pad already installed on the thermal-cooling assembly. It is not necessary to remove an existing pad or to clean the surface.