HP ProBook 455 G1 Notebook PC - Manual (Page 80)

10 Maintenance
Adding or replacing memory modules
The computer has one memory module compartment. The capacity of the computer can be upgraded
by adding a memory module to the vacant expansion memory module slot or by upgrading the
existing memory module in the primary memory module slot.
WARNING! To reduce the risk of electric shock and damage to the equipment, unplug the power
cord and remove all batteries before installing a memory module.
CAUTION: Electrostatic discharge (ESD) can damage electronic components. Before beginning any
procedure, ensure that you are discharged of static electricity by touching a grounded metal object.
CAUTION: To prevent information loss or an unresponsive system:
Shut down the computer before adding or replacing memory modules. Do not remove a memory
module while the computer is on, in the Sleep state, or in Hibernation.
If you are not sure whether the computer is off or in Hibernation, turn the computer on by pressing the
power button. Then shut down the computer through the operating system.
NOTE: To use a dual-channel configuration when adding a second memory module, be sure that
both memory modules are identical.
NOTE: The primary memory is located in the bottom memory slot and the expansion memory is
located in the top memory slot.
To add or replace a memory module:
1. Save your work and shut down the computer.
2. Disconnect AC power and external devices connected to the computer.
3. Remove the battery (see Inserting or removing the battery on page 40 ).
4. Remove the service door (see Removing or replacing the service door on page 49 ).
5. If you are replacing a memory module, remove the existing memory module:
a.
Pull away the retention clips (1) on each side of the memory module.
The memory module tilts up.
70 Chapter 10 Maintenance