Using Hibernate Mode - Sony PCG-TR5MP Hardware Manual

Hardware Guide
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 in 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. The power indicator light is off in this mode.
To activate Hibernate mode, proceed as follows:
Press <Fn>+<F12>.
The Hibernating screen appears and the computer enters Hibernate mode.
Alternatively,
Click Start, and then Turn Off Computer.
In the Turn off computer screen, hold down the <Shift>-key and press Hibernate.
To return to Normal mode, proceed as follows:
Turn on the computer by pressing the power button.
The computer returns to its previous state.
✍
If you press the power button for more than four seconds, the computer will switch off automatically.
When the computer is in Hibernate mode, you cannot insert a disc.
Hibernate mode requires more time than Standby mode to be activated.
It takes more time to return to normal mode from Hibernate mode than from Standby mode.
Hibernate mode uses less power than Standby mode.
Do not move the computer until its power indicator turns off.
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Using your VAIO computer