I have the following setup:
A Windows 7 64 bit PC with a Intel core i7 on a ASUS Z87-K motherboard, connected via DVI to a monitor and via HDMI to a Onkyo TX-NR626 receiver. The motherboard has an Intel HD Graphics 4600.
This setup was working fine.
After a shortcircuit in my home the HDMI output of HD Graphics 4600 isn't working anymore. The DVI output is still working.
I first checked if the Onkyo input was working by connecting a PS3 to the same HDMI input and this is the case. So my first thought was that the hdmi output of the motherboard was broken by a voltage spike due to the shortcircuit.
I had a ASUS Radeon 5770HD card lying around so I decided to plug this into the PCI-E port of my motherboard. The DVI output of the 5770 is working but the HDMI is not. I thought this was strange because the 5770 wasn't plugged in at the moment of the shortcircuit.
I tried to connect my tv to the computer with a dvi to hdmi adapter and this is working, both on the Intel HD graphics and the 5770.
Next I reinstalled the drivers for both cards. Not the solution. Next thing I tried: booting in a linux live disc. Same behaviour in ubuntu studio: DVI is working, HDMI is not.
The HDMI output of the 5770 worked in my previous PC. I tried different HDMI cables.
Anyone an idea what the problem can be. I really don't understand why the 5770 doesn't work.