Sony VPCSE23FX - Manual (Page 143)

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Upgrading Your VAIO Computer >
Adding and Removing Memory
8 Slide the memory module into the memory module slot and push it in until it clicks into place.
!
Do not touch any components on the motherboard other than the memory module.
Be careful not to touch the wires and the projections inside the bottom cover.
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. Do not force the memory module into the slot in a wrong orientation, as it may cause damage to the slot and the module.
9 Replace the cover and the removed screws and then tighten the screws.
10 Turn on the computer.