Currently Being ModeratedAug 11, 2013 10:59 AM (in response to rynelandt)
Yes, unlikely as it semed, this solved this problem on a 2007 (I bought it because they last a long time) imac. I cannot be absolutely certain of the trigger which caused the loss of sound output but the problem certainly arose at about the time I upgraded the operating system to Mountain Lion. Internal speakers continued to work ok.
I used headphones and for what is worth I plugged and unplugged them a couple of times and then (this seemed to be the important bit) adjusted the volume in the system preferences and the sound returned after what has been several weeks without use of a Bose speaker system.
Currently Being ModeratedSep 15, 2013 2:14 PM (in response to Joe Holt)
Joe Holt solution solved my audio problem. Probably when I installed a new battery I moved the audio cable connectors.
Many thanks for your perfect explanation and pictures.
Currently Being ModeratedSep 30, 2013 7:29 AM (in response to Carsten.Roth)
I first tried every solution in this thread, with no success. I reset the PRAM, fixed file permissions (disk utility), rebooted multiple times, plugged in USB-headset, plugged in minijack, and even tried to install the latest combo update (which for some reason fails). The sound device was missing also when i booted into safe mode.
However, I did manage to fix the problem by booting into recovery mode (hold cmd+r while booting), and then simply reinstalling OS X. This doesn't erase or change any user content, so everything will be just as before when the installation is finished. (But as always - do have a backup just in case!) It just reinstalls the system files. And, the sound device problem was fixed. Yay!
Currently Being ModeratedDec 16, 2013 9:06 PM (in response to kendallfromaustin)
Yes! 1000 times yes! Apple told me I was going to need a new logic board but that sounded like a heap. If you have the problem with the greyed out volume and no inputs, don't pay Apple a dime until you try the trick in this video. Just move the audio cable from under the battery to the top of the battery. Pure effin magic.
Currently Being ModeratedJan 12, 2014 5:03 PM (in response to Carsten.Roth)
Exactly the same to me. No sound, no source. 1st gen MBA, 80 GB.
I tried everything. The SMC. Reinstallation of SL, plugging and unplugging headphones, deleting plist, repair permissions, toying with settings, zap PRAM. Nada. Nothing.
I suspect it's the cable, probably because of overheating placement under the battery, poor design with folding ribbon cable.
Then the hinge broke... Apple is no longer standing behind that problem.
I've stood behind Apple since day one. I have a bushel basket of their products.
We are all getting rotten Apples!!!!
Currently Being ModeratedFeb 14, 2014 7:04 AM (in response to Carsten.Roth)
I had the same problem no sound I tried resetting holding command option and P,R it would work for an hour then be gone again.
Then I tried holding command and D down while I restarted my computer the whole way through the restart and shazam it worked and I still have the sound for a full day now.
Currently Being ModeratedMar 11, 2014 6:09 PM (in response to RiazBudree)
This fixed my problem too! Thank you. I just went to System Preferences > Sound, clicked "output," and selected "headphones" (while wearing my headphones.