Sony VGC-LS1 - Manual (Page 109)

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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.
9 Replace the memory module compartment cover and tighten the screw.
10 Plug the computer, connect all peripheral devices, replace the back panel cover, and then turn on the computer.