HP ProBook 455 G4 Maintenance And Service Manual page 49

2. Remove the memory module (2) by pulling the module away from the slot at an angle.
NOTE: Memory modules are designed with a notch to prevent incorrect insertion into the memory
module slot.
Reverse this procedure to install a memory module.
HP ProBook 455 G4 models: When installing memory modules, if only one module is installed, be sure to
install it in the memory slot toward the outside of the computer.
CAUTION: Failure to install a single memory module in the outside slot may prevent the computer from
booting up successfully.
Component replacement procedures 39