Compaq V5100 - Manual (Page 153)

Removal and Replacement Procedures
Maintenance and Service Guide 5–63
4. Turn the system board upside down with the expansion port 2
toward you.
5. Disconnect the fan cable 1 from the system board.
6. Remove the four Phillips PM2.5×7.0 screws 2 that secure
the heat sink to the system board.
Removing the Fan/Heat Sink Assembly Screws, Part 2