2-28 Removal and Replacement HP Omnibook XE4100/XE4500
 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 heatsink screws in this order:
1.  Install all three screws lightly.
2.  Fully tighten the screws in the order marked on the heatsink.