Caution 
  Do not spin the fan blades with your finger or you could damage the fan’s bearings. 
 
Reassembly Notes 
•  If the thermal pad is damaged, use a sharp knife or scraper to carefully remove it from the heat 
sink, then attach a new thermal pad. 
•  Install the heat sink screws in this order: 
1.  Install all four screws lightly. 
2.  Fully tighten the screws in the order stamped on the heat sink. 
Service Manual  Removal and Replacement  2-43