HP Pavilion dm1-4211nr Entertainment Notebook PC - Manual (Page 52)

9 Memory modules
Depending on the computer model, it may have one or two memory module slots. The capacity of the
computer can be upgraded by adding a memory module to the vacant expansion memory module
slot, if it has two memory slots, 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.
NOTE: To use a dual-channel configuration when adding a second memory module, be sure that
both memory modules are identical.
To add or replace a memory module:
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 Suspend 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.
1. Save your work and shut down the computer.
2. Disconnect all external devices connected to the computer.
3. Unplug the power cord from the AC outlet and remove the battery.
4. Remove the service door (see Removing the hard drive on page 35 ).
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.
42 Chapter 9 Memory modules