Removing and Installing System Components | 175 
 
 
1  Remove the system-board assembly. See “Removing a System-Board 
Assembly" on page 170. 
WARNING: The heat sink may be hot to touch for some time after the system has 
been powered down. Allow the heat sink to cool before removing it. 
CAUTION: Never remove the heat sink from a processor unless you intend to 
remove the processor. The heat sink is necessary to maintain proper thermal 
conditions. 
2  Using a Phillips screwdriver, loosen one of the heat-sink retention 
screws. See Figure 3-19. 
Wait for 30 seconds for the heat sink to loosen from the processor. 
3  Remove the other three heat-sink retention screws. 
4  Gently lift the heat sink off the processor and set the heat sink aside 
with thermal grease side facing up. 
Figure 3-19.   Removing and Installing the Heat Sink