Hello everyone...this is all very tech-speak for me!!!
Here's my problem:
I have a new build (on old mobo) PC as follows:
Asus P5W DH Deluxe
Asus EAH5670 1GB graphics
Intel E6600 @ 2.4GHz
533MHz RAM 2x 1GB in dual channel mode
Samsung F3 1TB HDD
Win XP Pro SP3 32bit
I am connecting this via HDMI to a Denon AVR1910 receiver which in turn is connected to a Samsung UE40B7020 TV

The PC displays perfectly @ 1920x1080

even when running some games.
I have had no end of trouble with audio via HDMI.
i started with the Asus drivers that came with the graphics card.
No HDMI audio device was available to select in Control Panel/Sounds and Audio Devices
I then downloaded the driver from asus' website and tried that...nothing
I then went to AMD and tried Catalyst10.4 and got the ATi HDMI rear outputs selectable in Windows.....no good
I tried Catalyst 10.5 and 10.6 with the same result....
so then I tried the Realtek HDMI audio driver 2.49 and Hurrah the Realtem HDA HDMI device can be selected in Windoze!!!
It even makes some sounds.....for a very short while - until you start using the mouse!! and then the sound disappears and never returns.....until you are closing windows down when you hear the end of the windows closing sound.....
It's driving me nuts!!
I've put in support calls at Asus and AMD but it seems this has them baffled.
please help me get audio working all the time!! the whole purpose of this machine was to serve music and play the odd game on the big telly...like this it's useless!!