HP Pavilion DV4-2155 Maintenance And Service Manual page 53

4. Spread the retaining tabs 1 on each side of the memory module to release the memory module. (The edge of
the module opposite the slot rises away from the computer.)
5. Remove the memory module by sliding the module to the right 2.
✎
Memory modules are designed with a notch 3 to prevent incorrect insertion into the memory
module slot.
Reverse this procedure to install the memory module.
Maintenance and Service Guide
Removal and replacement procedures
4–11