Sony VGN-CS118E - Manual (Page 106)

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Customizing Your VAIO Computer
Using Sleep Mode
Sleep mode turns off the LCD screen and places the storage device(s) and the CPU into a low power consumption mode.
The orange power indicator light blinks slowly in this mode.
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If you do not intend to use your computer for a long period of time while it is disconnected from AC power, place the computer into Hibernate mode or
turn it off.
To activate Sleep mode
Click Start, the arrow next to the Lock button, and Sleep.
✍
When your computer is in Sleep mode, you cannot insert a disc.
Your computer comes out of Sleep mode quicker than out of Hibernate mode.
Sleep mode uses more power than Hibernate mode.
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If the battery runs down while your computer is in Sleep mode, you will lose all unsaved data. Going back to the previous work state is impossible. To
avoid loss of data, you should save your data frequently.