HP ProBook 6455b, 6555b, 6450b and 6550b Notebook PCs Maintenance and Service Guide

3. Grasp the edge of the memory module (2), and then pull it out of the memory module slot.
NOTE: Memory modules are designed with a notch 3 to prevent incorrect insertion into the
memory module slot.
Reverse this procedure to install the primary memory module.
Component replacement procedures 95