Shuttle SG31G2 windows 7
Gigabyte GV-R455D3 video card with HDMI (and VGA)
VGA connected to LCD monitor
HDMI connected via Marantz SR5006 to Samsung LCD TV
When the PC is connected directly to TV, HDMI is recognized and works fine (audio and video)
When PC is connected through AVR to TV (and any input other than the one on which the PC is connected) the PC claims to have an HDMI attached device (of course I don't see or hear it since the AVR has selected a different input)
When PC is connected through AVR with the appropriate HDMI interface selcted to connect input to TV then the PC says there is no device connected to HDMI and I get no video or sound. (i.e. I switch AVR to select input to which PC HDMI cable is connected)
This according to ATI Catalyst control center.
I'm running latest drivers (8.951.0.0)
When I try moninfo it tells me that the monitor info is the same when selecting the proper input or not on the AVR.
There are some differences in the moninfo report when connecting the PC directly to the TV but mostly in the audio section.
So my question is - how do I figure out what is wrong ?
Why is the device attached to the HDMI port not seen by the PC when the AVR has selected the PC as input ?
Why does moninfo see it but not the catalyst driver and hence windows 7 ?
another observation is that on rebooting the PC that the boot messages come out on both the VGA attached display and the hdmi through AVR to TV up until the windows screen then the HDMI monitor goes blank
I'm guessing that this is the point at which some more sophisticated ATI driver software takes over and kills the HDMI connection for some unknown reason.