HP G72-251 Maintenance And Service Manual page 54

Removal and replacement procedures
3. Spread the retaining tabs 1 away from the memory module. (The edge of the module opposite the slot rises
away from the computer.)
4. Remove the memory module 2 by pulling the module away from the slot at an angle.
Memory modules are designed with a notch 3 to prevent incorrect insertion into the memory module slot.
Reverse this procedure to install a memory module.
4–12 Maintenance and Service Guide