I used to suffer from a similar problem. Mine was related to the jack daemon.  
I ran alsamixer (from terminal) changed all values to 0, plugged AUX jack, then 
rebooted. 
After start up I changed them all back to original values, then rebooted. While 
rebooting I unplugged jack,. Now sound works.

I know you are probably looking for a permanent solution.

I hope this helps you. If it doesn't, try running lmms, for some reason
it invokes sound.

Sorry for poor English.

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Title:
  [MacBookPro3,1, Realtek ALC889A, Speaker, Internal] No sound at all

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