Sony VGN-N220E - Manual (Page 18)

18 n N
Getting Started
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To disconnect your computer completely from AC power, unplug the AC adapter.
Make sure that the AC outlet is easily accessible.
If you do not use your computer for a long period of time, place the computer into Hibernate mode. See Using Hibernate Mode (page 82) . This power
saving mode saves the time of shutting down or resuming.
The plug attachment can be detached and reattached with the plug in the reverse direction.