Sony PCG-NV290 - Manual (Page 161)

Upgrading Your Computer’s Memory
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3 Snap the connectors into place when the board is correctly seated, and close
the computer cover.
4 Replace the fastening screws on the bottom of the computer.
5 Make sure the system memory matches the amount of installed memory. See
“Confirming added memory capacity” for more information.
Confirming added memory capacity
After you’ve installed a new memory module, make sure the operating system’s
memory corresponds with the memory upgrade.
Do not touch any part of the motherboard or the other components inside the
computer.
Installing a New Memory Module