Did you disable the HDTV HDMI audio option from the Nvidia Control Panel?
http://nvidia.custhelp.com/app/answers/detail/a_id/2593
ja m8, Done it all but do a clean install of OS.
Did you see the pic where I was able to revert to DVI/no audio, using the reg edit in link. Unfortunately it did not reset windows to allow analog devices/use analog jacks.
OS was installed with an HDTV dsub connect, strictly analog, originally. Now same install but different card, different HDTV. Reports to OS nothing but digital capabilities of port. The TV now has no dsub port. Its done with a specific dvi>hdmi dongle which registers as a PC input. I just went HDMI not knowing. Now windows has compensated for the fact that nothing associated with the hdmi ports is analog, windows ignores the 3.5mm jacks because they are unnecessary for hdmi.
Now that its flipped digital, that's all it will do. I just wanted to use the mic, I been using since 2005.
See pic, its with the front panel detection disabled. That's the way the port looks whether mic plugged or not. pegged, no mic works.
There has got to be a way to re enable the windows OS for analog jacks. I reinstalled all realtek drivers while the NVidia panel showed a dvi/pc connection. I removed all realtek, then reinstalled lastest from gigabyte waaaaaaaaaaaaaaaaaaaaaaaaaaaa
a........

I keep banging my head cause some others will be getting new cards, maybe they still use analog hardware like me.
Need a usb digital mic I guess. Gigabyte has a beta bios that's states for better audio efficiency, but I will not do that without a clean install of whole mess.