Sony VPCZ11MGX User Guide

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Upgrading Your VAIO Computer >
Adding and Removing Memory
Removing and Installing a Memory Module
To change or add a memory module
1
Shut down the computer and disconnect all peripheral devices.
2
Unplug the computer and remove the battery pack.
3
Wait about an hour until the computer cools down.
4
Unscrew two screws (indicated by the arrows below) on the bottom of the computer and remove the memory module 
compartment cover.
5
Touch a metal object to discharge static electricity.