Sony VAIO VGN-Z500 Series - Manual (Page 91)

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Using Peripheral Devices
To change the sound output device
If you do not hear sound from the device connected to the HDMI 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.