Q: Just installed lion...no sound

Try going to Audio Midi Setup in Applications>Utilities and see if Internal Speakers are in the lefthand column. If so click on it and use the control gearwheel at the bottom to select this as your audio output device. You can also test the sound in Configure Speakers in the same panel. I wish you luck - my external JBL Creature speakers have stopped working since I installed Lion today!

Have you tried going into system preferences yet?

Go to System Preferences > Sound > Output Tab and make sure that either "Internal Speakers" or "Headphone Port" are selected. (Or whatever output you desire.)

See if that will bring your options back.

-Jack

Having the same problem.  Tried all the above suggestions, no luck.  No output devices to be found anywhere...  Hope I'm just missing something simple.

At the bottom of the Audio Midi Setup panel in Utilities there are plus and minus signs. Click the plus sign and see if your speakers appear.

Got it.  Figured it was something simple.  Just restarted with out having anything plugged into the audio outputs.  Back in business.  The upside- I pulled out some great old records while sound was down.

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Scratch that!  still nothing.  Thought I was in business b/c my volume bar was no longer grayed.  But still no input or output devices.

Message was edited by: stillhuman

Same problem on my 13" MBP (mid-2009)

I have same problem on my macbook pro 13-inch, Mid 2010

The beta had the same bug, but then changing the Audio Midi Output to 32 bit float fixed it. This time it isn't doing the trick.

Same problem on an 11" MacBook Air, stillhuman was right - just had to restart it.

Same problem on a 13" MacBook Pro, Mid 2010. Restart helps, but problem appears from time to time.

I tried restart, shutdown, reseting PRAM, clearing caches (using onyx), tried with/without headphones....nothing helps

I have an early 2011 13" MBP that works fine after upgrading to Mac OS X Lion 10.7 and a late 2009 13" MBP that has the same issue (Volume controls are greyed out) When I plug in headphones they come back, when I remove them they work, when I reboot they are greyed out again. I tried reinstalling twice, I changed several setting and deleted various cache files without any lasting effect. Where can I submit this bug?

Same exact problem for me. Pluging in headphones fixes the problem temporarily but as soon as I restart the computer, its back to square one (sound not working)

Same thing here.

It looks like we'll have to wait until Apple fixes this issue.

I'm using a MacBook Pro 13' 2011.