Sony VGC-LS30 - Manual (Page 108)

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Upgrading Your VAIO Computer
7 Remove the new memory module from its packaging.
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.
Be sure to insert the connector edge of the memory module into the slot while aligning the notch on the module with the small projection in the open
slot.