HP 3105m Maintenance And Service Manual page 67

2. Remove the heat sink assembly (2).
NOTE:
assembly and the system board each time the heat sink assembly is removed:
Thermal pads are located on the heat sink (1) and on the base enclosure (2) underneath the
heat sink.
Reverse this procedure to install the heat sink assembly.
ENWW
The thermal material must be thoroughly cleaned from the surfaces of the heat sink
Component replacement procedures 59