Sony Ericsson VGN-AR500 - Manual (Page 186)

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Troubleshooting
What should I do if I do not hear the sound from the sound output device connected to the
HDMI port?
Once you have connected a device to the HDMI port, you need to change the device for sound output if you want to hear
sound from the device.
To change the sound output device, follow these steps:
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.