No sound devices, macbook late 2006

Oh Jesus Christ, Apple, I spent an hour typing out this question, and then the page asked me to edit my computer information and in so doing it lost everything I wrote!   grrrrrrr

 

Anyway...

 

Today up updated the operating system in my Macbook.  It was still running Snow Leopard and I finally upgraded it to Lion. before doing this the computer was working perfectly.

 

Now that the update is complete there is no sound.

 

Specifically:

- The chime sound works perfectly on startup
- There is no audio at all during usage. neither through the speakers or through the headphone jack
- When any of the volume buttons are pushed, (F3, F4 or F5)  the image on the screen shows the volume to be full, and also a circle with a slash through it
- Under Preferences/Sound the spinning beachball spins for about 7 minutes before doing anything, This does not happen with any of the other preferences apps
- Preferences/Sound volume slider indicates the volume is at 100%
- Preferences/Sound the Mute box is checked and greyed out.  I cannot un-check it

 

- I have tried re-installing Lion
- I have done all of the updates
- I have rebooted umpteen times
- I ran Disk Utility, and everything is fine. Green text, the hard drive is working properly.

 

When I was installing lion in the first place, it would not install, and told me that a recovery system could not be created.  The good people at apple support had me turn on filevault. That worked, but then I turned it back off again as soon as I was finished installing.  I do not know if the sound was working or not before I turned off file vault, but it is not working now.

 

The computer was working fine before the upgrade this morning,  none of these things were an issue before the upgrade. What is the problem? did my drivers somehow get lost?


MacBook, Mac OS X (10.7.5)
Has invited:

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I solved the problem myself.  What I had to do was go into Library/Preferences/Audio, and delete the preferences.  Then I emptied the trash and restarted the machine.  New preferences files were created and the problem was solved.

 

What surprised me though is that this used to be the classic fix for the old OS 9 and earlier pre-unix operating systems. I did not know you could do this with OS X too.   It would also seem that no else knows it too, because of the hundreds of sites and forums I have read in the last 4 days.  This solution was never once suggested by any.

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