HP Compaq Presario,Presario C300 Maintenance And Service Manual page 107

4. 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.)
5. Remove the memory module by pulling the module away
from the socket at an angle 2.
✎
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.
Maintenance and Service Guide
Removal and Replacement Procedures
5–13