HP Pavilion DM4t-1100 Maintenance And Service Manual page 94

5. Disconnect the fan cable from the system board.
6. Follow the sequence embossed on heat sink to loosen the four Phillips PM2.5×7.0 captive screws
(1) that secure the fan/heat sink assembly to the system board.
NOTE:
assembly and system board components, it may be necessary to move the fan/heat sink assembly
from side to side to detach the assembly.
84 Chapter 4 Removal and replacement procedures
Due to the adhesive quality of the thermal material located between the fan/heat sink