After 10.9.3 upgrade no sound on digital/optical port

Hello All,
I have a problem with my Mini (Early 2009, 2GHz Core2Duo). After recent Mavericks upgrade to 10.9.3, sound through digital optical output port dissapeared.
1. I checked receiver's input, works with other devices on the same cable.
2. Cable output light is red (as always, seem Mac Mini transmitter works???)
3. Mavericks says that optical wire is connected to the port, in sound preferences there is digital/optical output available.
4. Speaker icon on Top Bar is greyed out and volume slider unavailable to adjust.
5. PRAM/NVRAM reset didn't help.
6. Receiver doesn't recognise signal because input led says Analog, normally Digital should be there.
Maybe this is a bug?
Please help.
Regards,
Kamil

Hey Guys,
After recent SMC+EFI update on Macbook Air (Mid 2013) OSX v10.9.3, my internal audio device disappeared,
I tried everything I could find in google with no luck. (NPRAM+SMC reset, reloading kents etc.)
THIS IS WHAT SOLVED THE PROBLEM FOR ME:
1. I opened /System/Library/Extensions folder, there I found besides the usual AppleHDA.kext, also an AppleHDA.kext.disabled one.
2. I switched between them (swapped their names, sometimes you'll have to do it from the "get info" menu to take effect)
-- if you don't have this AppleHDA.kext.disabled one, try searching for one lil older than yours in the internet
3. then I unloaded and reloaded the kent dir again-
sudo kextunload /System/Library/Extensions/AppleHDA.kext
sudo kextload /System/Library/Extensions/AppleHDA.kext
And voila!
Hope it helps someone, as I spent hours until getting this to work again

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: For )
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