Sony VGN-FE780G - Manual (Page 28)

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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 147) . This power
saving mode saves the time of shutting down or resuming.