Sony VGN-TX00 - Manual (Page 103)

103 n N
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.
Make sure to insert the memory module edge with a notch into the memory module slot.
9 Close the module cover and then tighten the screws on the bottom of the computer.
10 Reinsert the battery and turn on the computer.