Sony VGN S400 Series User Manual page 131

VGN-T300 Series models
To change or add a memory module
1 Shut down your computer and disconnect all peripheral devices.
2 Unplug the computer and remove the battery.
3 Wait until the computer cools down.
4 Unscrew the three screws at the bottom of the computer.
5 Turn over the computer and lift open the LCD.
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Upgrading Your VAIO Computer