HP Compaq nc6400 Maintenance And Service Manual page 126

Removal and Replacement Procedures
3. Spread the retaining tabs 1 on each side of the memory
module socket to release the memory module. (The edge of
the module opposite the socket rises away from
the computer.)
4. Slide the module 2 away from the socket at an angle.
5. Remove the memory module.
✎
Memory modules are designed with a notch 3 to prevent
incorrect installation into the memory module socket.
Removing the Memory Module
Reverse the above procedure to install a memory module.
5–30 Maintenance and Service Guide