Sony PCG-GR290P Manual

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If the built-in speakers are turned off, press the key combination Fn+F3 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 key combination 
Fn+F4, 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 key combination Fn+F3 or 
Fn+F4:

Double-click System in Control Panel.

Set the sound device to enable in Device Manager.

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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.

If you are using an external microphone, check that the microphone is plugged 
into the Microphone jack. See “Connecting an External Microphone” for more 
information.