Unfortunately, I didn't have a backup for 10.12.4, but I updated to version .5 and again lost the HDMI selection in sound prefs. I had used the last patch posted https://forums.macrumors.com/threads/guide-hdmi-audio.1499797/ which had worked. Called support and they of course directed me to the previous fix, but had nothing new. Anyone have any ideas? Any would be appreciated. Sorry I guess I should have posted this in Mac Pro Forum.
Mac Os Sierra
Version 10.12.5
Mac Pro Mid 2010 5,1
2 x 3.46 6-core Intel Xeon
64 GB 1333 Mhz DDR3
AMD Radeon R9 280X 3072 MB
Mac Os Sierra
Version 10.12.5
Mac Pro Mid 2010 5,1
2 x 3.46 6-core Intel Xeon
64 GB 1333 Mhz DDR3
AMD Radeon R9 280X 3072 MB
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