Sony VGN-N100 - Manual (Page 94)

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Upgrading Your VAIO Computer
8 Slide the memory module into the memory module slot and push it in until it clicks into place.
!
Do not touch any other components on the motherboard.
Do not damage the insulation sheet equipped for module protection.
9 Replace the memory module compartment cover.
10 Tighten the screw on the bottom of the computer.
11 Reinstall the battery pack and turn on the computer.