Using Hibernate Mode - Sony VGN-U750P VAIO Read This First Manual

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If you slide and hold the power switch for more than four seconds, the computer will switch off automatically. You will lose any
unsaved data.
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When the computer is in Standby mode, you cannot insert a disc.
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The computer comes out of Standby mode quicker than out of Hibernate mode.
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Standby mode uses more power than Hibernate mode.
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If the battery runs down when your computer enters Standby mode, you will lose any unsaved data. Going back to the previous
work state is impossible. To avoid loss of data, you should save your data frequently.
If the computer is not used for 25 minutes, it will enter System Standby mode when running on AC power. When running on batteries,
the computer also will enter System Standby mode after 25 minutes if unused. To avoid this, you can change the settings in the
Power Options Properties screen (right-click the power status icon on the taskbar - select Adjust Power Properties - select the
Power Schemes tab and change the settings in Settings for VAIO optimized power scheme).

Using Hibernate mode

The state of the system is saved on the hard disk and power is turned off. Even when the battery runs down, no data will be lost. The
power indicator light is off in this mode.
To activate Hibernate mode, proceed as follows:
Slide the POWER switch in the direction of the arrow (default assignment).
The Hibernating screen appears and the computer enters Hibernate mode.
If the folding keyboard is connected to your computer,
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Using your VAIO computer