Sony Notebook Manual De Usuario

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If the built-in speakers are turned off, press the Fn+F3 keys simultaneously 
to turn on the speakers. You can also turn on the speakers using the center 
Jog Dial™ control.

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If the speaker volume is turned to the minimum, press the Fn+F4 keys 
simultaneously, and then press   or   to increase the volume or you can 
use the center Jog Dial™ control to adjust the volume. 

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If nothing is displayed when you press the Fn+F3 or Fn+F4 keys 
simultaneously, then do the following:

Click Start on the Windows® taskbar, then Control Panel, and then 
Sounds, Speech, and Audio Devices.

Click Sounds and Audio Devices. The Sounds and Audio Devices 
Properties dialog box appears.

Make sure the Volume tab is open and the Mute check box is not 
selected.

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If your notebook is powered by batteries, check that the battery packs are 
inserted properly and that they are charged.

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If you are using an application that has its own volume control, check that 
the volume is turned up.

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Check the volume controls in the Windows® taskbar.

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If you connect external speakers, check that the speakers are properly 
connected and the volume is turned up. If the speakers have a mute button, 
make sure it is off. If the speakers are powered by batteries, check that the 
batteries are inserted properly and that they are charged.

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If you have connected an audio cable to the Headphone jack, disconnect the 
cable.

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If you are still experiencing problems, use the supplied Driver Recovery CD 
to reinstall the drivers. See “To use the Driver Recovery CD(s)” for more 
information.