HP ProBook 6555b Notebook-PC - Manual (Page 121)

11. Insert a memory module:
a. Align the notched edge (1) of the memory module with the tab in the memory module slot.
CAUTION: To prevent damage to the memory module, hold the memory module by the
edges only. Do not touch the components on the memory module and do not bend the memory
module.
b. With the memory module at a 45-degree angle from the surface of the memory module
compartment, press the module (2) into the memory module slot until it is seated.
c. Gently press the memory module (3) down, applying pressure to both the left and right edges
of the memory module, until the retention clips snap into place.
12. Align the notched edge (1) of the keyboard with the tabs in the keyboard slot and lower the keyboard
(2) until it is seated.
Upgrading a memory module in the primary memory module slot 111