19.Tighten the hard drive cover screws (3).
20.Replace the battery.
21.Connect AC power and external devices to the computer.
22.Turn on the computer.
To add or replace the secondary 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 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.
1.Save your work and shut down the computer.
2.Disconnect AC power and external devices connected to the computer.
3.Remove the battery.
4.Loosen the 3 hard drive cover screws (1).
Adding or replacing memory modules 43