No sound after OSX 10.7.4 update

Hi,
I'm using the MBP 17" (2011) model.
Everything works fine until I updated to OSX 10.7.4
I had read several comments about this issue, but still could not solve it.
Detail:
1. The volume logo turned to gray, and it was locked
2. In symtem sound preferences, it stated that "No output devices found" as well as "No input devices found"
3. There is no red light out from my AUDIO input as for many other does.
4. I had tried PRAM resetting for several times, but still does not works.
5. I had tried deleting com.apple.BezelServ...... as what suggested by some people, but does not work also.
6. The disk utility first aid does not solve the issue.
I ever had this problem with my old MB 13" while I'm watching movie.
It had been solved by PRAM resetting, but this time the PRAM resetting could not solve the problem for my MBP 17".
Thanks in advance for those who are going to help

Wow things are getting bad. I have the same problem after updating to 10.7.4
The control icon is greyed out and there is nothing in the 'sound preferences' that allows this to be remedied.
Some of the solutions here are draconian (I should not have to reinstall to fix this, Steve Jobs would be turning in his grave) and Apple should be rightly ashamed that such a essential feature has gone to ground in the latest update.
Sane solutions appreciated. I can't record, I can't playback existing music, iTunes is useless, I'm not keen on silent movies, can't use Acrobat Connect.......the list goes on.

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