Sony VGN-TX750P - Manual (Page 124)

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Upgrading Your VAIO Computer
7 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.
Make sure to insert the memory module edge with a notch into the memory module slot.
8 Close the module cover and then tighten the screw on the bottom of the computer.
9 Reinsert the battery and turn on the computer.