Sony VGN-U750P VAIO Read This First Manual page 52

2 Plug the power cord (1) into the AC adapter and an AC outlet.
3 Plug the cable attached to the AC adapter (2) into the DC In port (3) on the port replicator (4).
4 Slide in the computer gently on the holder, fitting the guide rails (1) of the holder into the grooves (2) on the battery.
The Download and
!
Do not attach your computer to the port replicator with excessive force, as it will cause
a malfunction or result in damage.
(External Display) buttons on the port replicator light green.
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Using your VAIO computer