Sony VGN-NS150J - Manual (Page 151)

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Troubleshooting
How do I change the sound output device?
If you do not hear sound from the device connected to the USB port, you need to change the device for sound output.
1 Close all open programs.
2 Click Start and Control Panel.
3 Click Hardware and Sound.
4 Click Manage audio devices under Sound.
5 On the Playback tab, select the desired device for sound output and click Set Default.