Sony R505 Manual

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If the built-in speakers are turned off, press the Fn+F3 keys or use the center 
Jog Dial control to turn on the speakers.

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If the speaker volume is turned to the minimum, press the Fn+F4 keys, then 
press   or   to increase the volume, or you can use the center 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, proceed as 
follows:

Click Start, point to Settings, and then to Control Panel.

Click Sounds and Multimedia. The Sounds and Multimedia Properties 
dialog box appears.

Select the Audio tab, and click Advanced in the Sound Playback box. 
The Advanced Audio Properties dialog box appears.

Make sure the Speakers tab is open, and the correct speaker setup is 
selected in the Speaker Setup box. Click OK.

Click Volume in the Sound Playback box. The Volume Control dialog 
box appears.

Make sure the mute check boxes are not selected in the Volume Control 
and Stereo Wide columns.

Close the Volume Control dialog box.

Click OK.

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If your computer is powered by batteries, verify the battery packs are 
inserted properly and are charged.

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If you are using an application that has its own volume control, verify 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:

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Verify the speakers are properly connected and the volume is turned up. 

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If the speakers have a mute button, make sure the button is off.