Sony VGN-Z790D - Manual (Page 196)

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Troubleshooting >
Audio/Video
How do I change the sound output device?
If you do not hear sound from the device connected to a port, such as the USB port, HDMI output port, optical output port, or
headphones jack, you need to change the device for sound output.
!
The HDMI output port is functional only when your computer is in SPEED mode.
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.