This may not be the right place to ask this, but I've scoured the internet and haven't found a working solution yet.
Windows Media Center gives an error when trying to play live TV over an HDMI connection to a Samsung PN43D430 TV. The player comes up with a live picture of the correct channel then says "Files needed to display video are not installed or are not working correctly. Restart Windows Media Center or restart computer." - neither of which work of course. Playing "Internet TV" is just fine over HDMI, as is Netflix.
Several "solutions" that I've seen have involved replacing the Nvidia HDMI Audio driver (done, didn't help), Setting Windows to 2.0 sound and WMC to 5.1 (also done, didn't help), disabling WMC in Windows Features and reinstalling it (done, completely new setup, didn't help).
I noticed that the speaker "Test" in the Media setup doesn't produce a sound, but moving the mouse does. So the system sounds are fine. Again "Internet TV" plays fine and with sound.
I tried the Windows Media Center troubleshooters which made no difference.
The SiliconDust HDHomerun Tuners also feed a second PC which plays live TV on its local monitor with its local speakers with no problems.
The system is fully updated via Windows Update and from the manufacturer support site.
Windows 7 Pro 64bit
Tuner: SiliconDust HDhomerun
Crucial 64GB SSD
4GB 1333 Samsung RAM
Samsung PN43D430 connected directly via HDMI, no other components in the way.
(Probably buying a 5.1 system to put between them if I can ever get this working... but really don't want to invest in it before I get my last purchase, the TV, up and running completely.)