Sound volume problem after upgraded to Lion Mac OS X 10.7? Any help?

And now for the final act...

THE SOLUTION...

Yes folks, after working with the crack team from Apple Care (James and Company) a solution to this issue was discovered.

For all the about issues, it comes to this.

Reboot System

Hold Command+R (Recovery Mode)

In Recover Mode, select Disk Utility (This insures that Macintosh HD is not mounted)

Run

Disk Repair (x2)

Disk Permission Repair (x2)

Restart

If still having issues

Command+R

Install in Place (Reinstall - This takes and replaces any files that may have been overwritten and rewrites them)

After installation, check if system is okay, If not

SMC (Shift+Option+Command+Power)

HW Reset (Command+Option+Power)

PRAM (Option+Command+P+R)

If still not functioning... Here is the FINAL Solution

Since this formula is to take out the grossest of errors on the OS side, Take a moment to create an alternate user with Admin permissions

Log in to this account

If everything is now functioning, the corruption is a hangover from SL and you will need to move all of your data (only the data) to the new account.

Beware of MobileMe.

Before starting the transistion to this account, turn MobileMe off - No Syncing, No iDisk, No Nothing! This will prevent MobileMe from rewriting the corrupt information into your new account.

Collect all of your data, serial numbers for 3rd party Apps, eMail and other items. This will take some time, but it is worth the ride.

Once this is all complete, your system will be rock solid stable.

Christopher Reynolds, ASQ CRE, PMP, BS IS

I certainly plan on waiting for the next update before going unecessarily "under the hood". That said, by simply reapiring disk permissions with the Disk Utility, the problem seems to have disappeared! I will keep a close eye and report back if I am mistaken or have missed something.

Fingers crossed.

This may not apply to everyone, but on a Mac Pro tower on which I had lost sound on my external speakers after installing Lion I simply switched the cable from the port at the rear to the headphone port at the front, and the sound came back. I swear I had tried this before, but when I was using iTunes. This time I was playing a track on YouTube. Doesn't make sense, I know, but it worked. Have restarted, sound still there. And it's there on iTunes as well.

The greyed out icon is fixed through headphone insertion/removal but the external speakers on the lcd display do not work. if selected they jump back to the MBP 13" internals. And some programs lose sound without warning. So when is this fix coming?

Hmm... Been enjoying my shiny new 13" MBP for 2 days now. So I installed 8gb ram this afternoon, all looked good 🙂 only a few hours later I notice the sound has gone.

System Settings > Sound > Output is empty. No devises... 😕

I'll try the PRAM Test soon as I've cleard the thousand or so files from the trash can.

Maybe I'll be coming back for you kind help soon.

hi guys, I had MBP 2011 with Snow Leopard then i upgraded it to Lion in Sept 2011, everything was working for almost 6 months since then. Now last night i just opened my macbook and found no sound at all, also the icon is greyed out. I tried below things as mentioned in all the post on internet regarding this issue.

1) restatred the machine many times

2) reset the PRAM

3) headphone jeck IN/OUT method

4) Checked in System Pref > Sound > Output

NOTHING WORKED YET.

But i noticed one thing while doing headphone IN/OUT. When i put the headphone jeck IN, the sound comes out from the...

1) headphone if i select System Pref > Sound > Use Audio port for Sound: Sound Output

2) macbook internal speakers if i select System Pref > Sound > Use Audio port for Sound: Sound Input

Can anyone got the solution yet.

Please help.

One more thing i would like to add... i also noticed the red light coming out from the headphone jeck hole. What could be the problem? is it some kind of hardware issue? i don't have macbook on warranty as i didn't purchased with international warranty.. please suggest.

The red light means an optical digital output as been picked as audio output,instead of analogue signal. So try to set the speaker as the output from the setting, otherwise

You will see a click in the hole of the headphone jack, you need to use a pin to switch it back to analogue.

I just had this problem today. I've been on the phone with support for half the day with no solution. I reset the PRAM and reset the system settings. Nothing worked. I even reinstalled the OS. But I did find a solution. Go to: Macintosh DS/Library/Preferenes/Audio and delete the "com.apple.audio.DeviceSettings.plist" and the "com.apple.audio.SystemSettings.plist" files. Restart and you are back in the game. Take note Apple. This was the solution. Thanks, Chris at Douglassmithdesign.com

I fianlly solved the problem by changing the False to True on this plist

https://discussions.apple.com/thread/3203808?start=15&tstart=0

Have you performed a PRAM reset?

(Restart your computer, then hold command + option + P + R until you hear the startup chime a second time.)

Sounds like an incompatibility with the 64bit kernel. This will be addressed in an update, almost certainly.

The midi solution does not work, if the midi program crashes each time

tried that as I always used external speakers, but now I have no output at all, no external or internal, tried the smc and the pram, no fix there

Oh thanks! that works perfectly..it's annoying to have to do it but really simple...thanks! Kate