HP COMPAQ NC2400 Maintenance And Service Manual page 155

2. Remove the Torx8 T8M2.5×4.0 screw 1 that secures the
speaker to the base enclosure.
3. Remove the speaker 2 from the base enclosure.
Removing the Speaker
Reverse the above procedure to install the speaker.
Maintenance and Service Guide
Removal and Replacement Procedures
5–63