Somebody in here had an issue with HDMI audio.
I had the same issue where there was no audio coming from HDMI connection
using Radeon HD 2400
I was getting a message from Catalyst Center that the HDMI-DVI adapter
didn't support audio, on windows startups.
Then I found out that I had another HDMI-DVI adapter, and after trying it, I
finally got sound from the TV/speakers.
>> Stay informed about: HDMI audio