Sony PCV-RZ49G - Manual (Page 278)

I can see the TV image but there is no audio
If there is no audio, then check that audio is on. Try the following:
 Turn up the volume.
 C heck whether you pressed the MUTE button on the remote.
 C heck that your speakers are working correctly.
 C heck the Microsoft Windows system volume. You might need to adjust your system volume.
Alternatively, your audio tuner might not have an up-to-date driver. C onsult the hardware documentation for information on how to
update your driver.
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