Firstly let me say I have tried searching the net with regards to this issue and while you get millions of results on how to disable the audio, I'm looking to do the opposite and disable the display (if at all possible)
As we are all aware with HDMI, the handshaking can be a pita especially on a PC, and using an AVR between seems to only make things worse, with seemingly pointless breaks in the signal when you for example open a game.
To get around this I decided to connect my TV (42LD450) directly to the GPU (GTX580) via DVI-HDMI cable and connect the AVR (Onkyo 876) aswell using the mini-HDMI.
This created it's own set of problems that seem to be recurring each boot and is making me consider going back to anologue 5.1 again.
Let me explain the problem I'm (and I'm sure others are) having.
If I boot with both the receiver and TV on I'm left with a flickering mess as the AVR is detected as having a 29Hz interlaced display which is obviously conflicting with the 60Hz TV.
I can get around this by leaving the AVR off until I get onto the desktop and then it will work okay (most of the time). However it will have changed back the AVR to 29Hz again which causes the GPU to run at full 3D clocks/volts so I have to remember to switch it.
So is there anyway I can get Windows to see it as an audio device without having it as a display?
Or perhaps a way to force the 60Hz refresh rate for the AVR?
I have since connected a dell monitor to the AVR over HDMI, which has the same resolution and refresh rate as the TV, so long as it is on at boot then everything works as it should, but I don't want to have to run a second display all the time. (Switching it off or disconnecting results in the same flickering/handshaking issues.)