To replace a memory module:
1. Remove the computer cover. Refer to “Removing the computer cover”.
Note: For this procedure, it helps to lay the computer on a flat, stable surface.
2.Locate the memory module connectors. Refer to “Locating components”.
3.Remove the memory module being replaced by opening the retaining clips as shown.
4.Position the new memory module over the memory connector. Make sure
the notch 
on the memory module is correctly aligned with the connector key 
on the system board. Push the memory module straight down into the connector until the retaining clips close.
5. Refer to “Completing the installation”.