HP Compaq NC4400 Maintenance And Service Manual page 151

3. Disconnect the modem module cable from the two
connectors 1 on the system board.
4. Remove the two Phillips PM2.0×4.0 screws 2 that secure
the modem board to the system board.
5. Lift the right side of the modem board 3 to disconnect it
from the system board.
6. Remove the modem board.
Removing the Modem Board
Reverse the above procedure to install the modem board.
Maintenance and Service Guide
Removal and Replacement Procedures
5–69