Sony PCG-XG29 - Manual (Page 118)

VAIO® Notebook User Guide $
7
Install the memory module as described in the following graphic.
8
Gently replace the keyboard, then press it into your computer. Be
careful not to detach the cable when replacing the keyboard.
9
Close the computer cover, and tighten the screws on the bottom of the
computer.
1 Slide the memory module into the slot.
2 Press the module into place until it clicks.