Sony VGC-LT18E - Manual (Page 22)

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Getting Started
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You can bundle the AC adapter cable along with other cables to keep them tidy. Snap open the cable clamp, route the cables through it, and then snap
the cable clamp back shut as shown below:
To disconnect your computer completely from AC power, unplug the AC adapter.
Make sure that the AC outlets are easily accessible.
!
If you unplug the AC adapter from your computer while the computer is on or in Sleep mode, you may lose all unsaved data.