Sony Personal Computer Manual

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

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If the speaker volume is turned to the minimum, press the Fn+F4 keys, and 
then press 

 or 

 to increase the volume or you can use the Jog Dial 

control to control the volume. 

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

Click Start, point to Control Panel, click “Sounds, Speech, and Audio 
Devices,” and click “Sounds and Audio Devices.” The Sounds and 
Audio Devices Properties dialog box appears.

Verify that the Mute box has not been checked, and that the volume is 
not on the lowest setting. You can choose advanced options to 
customize audio settings.

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If your computer is battery-powered, check that the battery pack is inserted 
properly and that it is 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 Windows®.

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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.

Use the preinstalled PowerPanel™ software to set the CPU control to 
Performance. Do the following: