It has been more than a couple of months I have been looking for solution and I haven't found any yet. Here's my problem:
- startup sound works
- no 'internal speaker' in 'output device' in sound setting.
- Audio midi setup has master volume set to 0. Cannot change the value.
This all happened after Yosemite update.
I have tried following so far
- PRAM reset
- sudo killall coreaudiod
- plug in headphone and plug out (slowly, quickly and at every speed possible)
- re-installing Yosemite
and other few I don't remember. I am now tired of looking for solution. I hope somebody here will be a god to me.
Thanks in advance.