Sony PCV-RS310 - Manual (Page 54)

VAIO Computer System Reference Manual 40
9 Press down firmly and evenly at both corners until the module is
fully seated.
10 Replace the power supply (see “Replacing the Power Supply” on
page 48).
11
Replace the cover (see “Replacing the cover” on page 28).
12
Reconnect the power cord and turn on the computer.
After restarting your computer, the system recognizes the additional
memory and automatically make the proper configurations.
✍
When the module is fully seated, the latches on each side are upright and locked
into the slot on each side of the module. If the latches are not upright, continue to
press down gently on each side of the module until the latches lock into place.