For anyone that is using a H77n-WIFI with i3 3225 based system, I had to do a few tinkering of settings to get the audio working. In audio, I mean the normal digital audio, not HDMI. I had to add the kext dev mode option to cut to the chase of my story! I kept trying to use a DSDT and it would always freezes at the gray screen with the progress bar stopping half way, I know this is to add HDMI audio, but I was desperate for any audio at this point. The only way to get the audio to work, because that was my only issue, was the kext dev mode option. I hope this helps someone else. I need really saw any other way to do this. Been upgrading for a while and this one was a real pain in my ***.
EDIT: As I tried to follow the Multicast install to the "T", I missed the already highlighted kext dev mode option. I had to manually check this box, where on the guide it was not the same in my case. Thanks!