Sony VAIO PCG-V505CP Hardware Manual page 23

Using your VAIO computer
Combinations/ Feature
<Fn> +
<Fn> + B
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* This function can only be used by the first user to log on. It will not work if you have switched to another user account. If
another user wants to display on an external monitor or TV, use the monitor properties to switch to an external monitor or TV.
!
Some functions are not available until Windows is launched.
Troubleshooting sound
My speakers are not producing sound
The built-in speakers may be turned off. Press <Fn>+<F3> to turn on the speakers.
The speaker volume may be turned to the minimum. Press <Fn>+<F4> and then
volume.
If your computer is powered by battery, check that the battery is inserted properly and that it is charged.
If you are using an application that has its own volume control, check that the volume is turned up.
Check the volume controls in Windows.
Functions
Provides for the lowest level of power consumption. When you execute this command, the
states of the system and of the peripheral devices are written to the hard disk and the system
(F12): Hibernate
power is turned off. To return the system to its original state, use the power switch to turn on
the power.
Activates BassBoost. This means that the bass sound level is enhanced at all levels without
distorting other frequencies.
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or to increase the