No HMDI Sound - Mac Mini + OSX10.10

I have a mid-2010 Mac Mini that I use as a media server. I can not get HDMI sound out (video is no problem). I have the Mac Mini connected to a Pioneer receiver then to a Phillips TV. (When I connect direct to the TV, I can get stereo sound through HDMI - the Mini recognizes only 2 channel stereo). When I connect to the receiver, HDMI recognizes its 5.1 (using MIDI Setup), but I can test get any test sounds.
Previously I was running Mavericks 10.9.2 and had no issues. I know from some reading beyond 10.9.2 there were issues with HDMI sound. Due to an OS crash and trip to the Genius Bar, I ended up with 10.9.5 reloaded on my Mini. Knowing this did not work, I upgraded to 10.10 hoping Apple resolved the HDMI issue.
I have tried the SMC and PRAM resets - no help.
Does anyone in the community have a recommendation - or a way to roll back to 10.9.2? I have no data on the Mini - its used to drive Plex.
Thanks

I have a similar problem. Upgraded my mid 2010 mini to 10.7.4 and now the mac mini outputs only two channels via HDMI cable to my receiver. It worked fine before while running 10.7.3 and earlier. I really want to keep all sound and video going through the HDMI cable--it was a costly set up and I want to use it as it's supposed to work. (I don't want to use a separate audio cable to solve the problem and it sounds like it wouldn't solve it anyway).
My other devices work fine going through HDMI and my receiver--Apple TV, BluRay player and U-verse set-top-box. It's just the mini and just since the OS upgrade.
How does one reset PRAM and SMC, and what are those, anyway? Also, how does one fool with midi app settings? I use the mini primarily to play itunes music and I didn't see anything called midi app settings in the itunes preferences.
Thanks for any insights...

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all posts relating to my query are very old so I pray someone can help with an updated solution.
I purachsed an Apogee DUET FIREWIRE to work with ABLETON LIVE 9 on my MAC MINI 2011 i7 16gb runing OSX 10.9.5 (ok - so i can see alreday that I am not on YOSEMITE - but the APOGEE driver application states its for 10.9 and 10.10). It second hand
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I also have a static IP for my AEBS.
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Hi!
I just got a mac mini to use in my home theater. Untill now I have been using my PS3 to play back .mkv files converted to .mpeg i mkv2vob.
My receiver, a Denon 3806, was connected to the ps3 via hdmi and had no trouble playing the files with full 7.1 multichannel sound. The ps3 spits out LPCM and my receiver plays it as "multi channel in"
The mac mini however will not play any sound at all via hdmi. I have tried all the things suggested in this forum regarding the problem.
- how come the receiver will accept LPCM from the ps3 and not from the mac mini?
regards
Jesper, Denmark

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Try this:
http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quic ktime/
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Message was edited by: KARTHIK_SPARTA

Well I'm sorry for the late reply. But I'm back with a Solution for the "Tick Sounds" on the Mac's. After researching carefully, I happened to learn that , the Tick noise in SSD HD is because of the Head Parking of the pointer on the HD. Hence in order to get rid of the Tick sound, I would suggest all , to turn off/Disable the option "Put hard disk to sleep whenever possible" in Energy Saver section of System Preferences. Thus when the system is idling or in use (awake), you don't get to hear the Tick Sound's. Well after careful observation for almost a month now, I hardly get to hear the Tick Sound once in a day or so.
In Energy Saver "Put HD to sleep whenever possible" is more useful to portables like, MacBook Pro or MacBook Air , since it will consume less battery, and thus enhance the battery life but not for machines like iMac/Mac Mini.
Also some people have installed some 3rd party utilities like Hard Disk Advanced Power Management (HDAPM) to minimise the head parking or reduce the Tick Sound. I would personally not suggest to go for it, since it will change the default behaviour of the HD set by the manufacturer and may corrupt the HD and it may eventually fail. But if you would really like to give it a try, go for HD SPY utility in Mac Appstore , since Apple would have released the utility after taking due consideration in the Appstore.
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