I have a Vista SP1 Home Theatre computer connected to a SONY STR-DG920 amp.  The video is excellent, but there is no sound.  When I go into Sound > Playback> Digital Output Device (HDMI), it says that it is the default device and working properly.  Does anyone have any ideas?


MOBO: Gigabyte Hybrid GA-MA78GM-S2H with integrated sound and graphics card.

Is there a setting in your bios that has HDMI sound input or output?

check your sound card setting (right click on the speaker in the task bar and click playback devices).  Ensure that the following is true:

1:)    HDMI is set as the default audio output device
2:)    under properties->supported formats, dolby digital is checked.
3:)   under properties->supported formats, 48Khz sample rate is checked.

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