Sony VGC-LT18E - Manual (Page 171)

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Troubleshooting
What should I do if I do not hear the sound from the device connected to the OPTICAL
OUT port?
Once you have connected a device to the OPTICAL OUT 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.