Ok... I've reinstalled the the drivers and still no sound via HDMI to my receiver. I have check the catalyst menu and there is no audio setting.. so i went into the audio settings in my pc and Rockfish is the only audio card listed. I am trying to set up a media pc with blu ray and DTS HD audio. I have over 60Gigs of 24bit audio so i would like to keep the Rockfish. HELP!
With Win 7 it's easy to just right click the sound icon in the TRAY (bottom right) and click "Select Output Devices" or something along those lines, then like the above, set the HDMI to the default output.
Alternatively, you may only be installing the Video drivers and not the Audio... just make sure, if the selection isn't available.
Not sure if you got this issue sorted...but I did, so just wanted to share.
I had this same problem... No Audio with my new ATI HD5570. Tried a few things...including the latest ATI card drivers (11.7) and tried going through many of the settings other's suggest....all to no avail.
I am running a HDMI to CAT5e to HDMI extender about 16M long.
I started changing cables over, and trying other TV's....still Failed.
But then.... got it going nicely when I installed the Latest HDMI realtek (hdmi_r255.exe) driver.
Too easy! Just install, hit the - Sound Devices > Playback > select HDMI Audio. Did the trick for me.
Hope that helps.