HP Compaq NC4010 Maintenance And Service Manual page 112

Removal and Replacement Procedures
4. Disconnect the fan cable 1 from the system board.
5. Loosen the two spring-loaded T8 M2.0×10.0 screws 2 that
secure the heat sink to the base enclosure.
6. Fold back the insulator material 3 to expose the heat sink
screws 4.
Removing the Heat Sink Screws
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