Chosen Solution
Since some time I suddenly have no sound through the headphones output nor through the internal speakers. When you look at sound settings in system preferences, no internal speakers are shown nor does the headphone output show when something is plugged in. Do get sound through USB->external audio-bridge but lately the sound is getting distorted more and more and at random. Tried all I could think of and what was suggested online; PRAM reset, SMC reset, pick tooth in headphone bus, even a rain dance and more. No success :-( I slowly suspect that the sound card is broken. Could this be the case and can this only be repaired by completely replacing the logic/motherboard because the soundcard is integrated with it?
Thank you all for trying to help out! Unfortunately none of the suggested solutions solve the issue so I plan to visit an Apple Service center soon.
Hi .it sounds weird…it should be fixed with reinstalling OSX… but reinstalling from start… Check this but i guess you already did : https://support.apple.com/kb/PH22067?loc… also do a reset holding Option-Command-P-R keys all together before the gray screen appears. Continue holding these keys until computer restarts for 4 times, then release those keys and allow to restart normally.. Sometimes this problem can happening without reason at all and come back…
I had exactly this problem with same imac because accidentally i deleted an essential file doing some testings.. reinstalling OSX will fix it but first take these files you want because will lost any personal files or serials.
Hello again. Because my answer was not so detailed…. It depends of what OSX version you running. If its Snow Leopard i dont think you can do anything only to reinstall OSX as i wrote before.. Before that as final try put a suitable headphones jack at behind imac and do that 4 or more times and check at system preferences at sound if internal speakers appear .play with output volume bar and make some restarts.. Also try to restart at safe mode holding down shift till osx is loaded. then restart normal..If did not fixed then reinstall OSX.. If you running Yosemite or later check if airplayXPC helper is running at activity monitor..
When there is no sound, try recording on the device if a sound is output, the earphone or microphone has nothing to do with the defect.the defect in ic audio replacement
