HP Compaq NX9000 Reference Manual page 68

4. Insert the RAM board into the connector at about a 30 degree angle until it is
fully inserted. Then press down at both sides until both latches snap closed.
Match your notebook to one of the following illustrations.
5. Replace the cover.
6. Insert the battery.
To remove the RAM module, release the two latches at the sides of the module.
Add-On Devices
Installing Additional RAM (Memory)
Reference Guide 59