Currently Being ModeratedAug 31, 2012 4:03 PM (in response to ObiJuan2080)
Have you tried turning up the volume and please describe the exact process you did to reset the PRAM and SMC, please do not skip a step. Also check to see if anything is plugged into the audio connectors in the back.
Currently Being ModeratedAug 31, 2012 4:19 PM (in response to rkaufmann87)
"Have you tried turning up the volume..."
Yes I have and I get what you see in the bottom of the pic.
"...please describe the exact process you did to reset the PRAM and SMC..."
The procress on resetting both PRAM/NVRAM and SMC were no different from these:
SMC Reset: http://support.apple.com/kb/HT3964
PRAM/NVRAM Reset: http://support.apple.com/kb/HT1379
I followed both of these instructions carefully.
"...please do not skip a step."
I assure you, I did not.
"Also check to see if anything is plugged into the audio connectors in the back."
Nothing is hooked up to the back of the iMac except my Firewire 800 external HDD and USB External HDD, which I'm assuming has no connection to the audio connectors of the iMac.iMac (27-inch Mid 2011), Mac OS X (10.7.3), 3.4GHz i7, 16GB RAM, ATI 2GB VRAM
Currently Being ModeratedAug 31, 2012 4:27 PM (in response to ObiJuan2080)
There are multiple methods for resetting the SMC based on the type of Mac you have. Please describe the steps you took for your iMac, they are totally different than those of say a MacBook or MacBook Air.
Currently Being ModeratedAug 31, 2012 4:31 PM (in response to rkaufmann87)
iMac (27-inch Mid 2011), Mac OS X (10.7.3), 3.4GHz i7, 16GB RAM, ATI 2GB VRAM
- I Shut down the computer.
- I unplugged the computer's power cord.
- I waited fifteen seconds.
- I then attached the computer's power cord.
- I waited another five seconds, then I pressed the power button to turn on the computer.
Currently Being ModeratedSep 1, 2012 12:44 AM (in response to ObiJuan2080)
Try resetting it with all the peripherals unplugged. Leave them unplugged and then retry the sound. If that doesn't work create a new user account (call it TEST ACCOUNT), log into it and see if you have the same issue. If it disappears you know it's a software issue in your normal user account and not global.
Currently Being ModeratedSep 1, 2012 4:33 PM (in response to rkaufmann87)
I found a work around to this problem. I went to the Activity Monitor and Quit the "coreaudiod" service. This service restarts on its own almost immediately after quitting of course. I went to my son's 2nd B-Day party so I haven't turned on my iMac yet to see if it's a permanent fix. I'll keep you posted.
Currently Being ModeratedDec 3, 2012 4:41 AM (in response to ObiJuan2080)
If its any use to anybody I had this exact same issue with no sound. I googled and tried everything suggested to no avail so booked a Genius appointment.
I then remembered I had been trying to get the Dictation tool to work so I could dictate into the word processor instead of typing. So I went to Dictation and Speech and simply turned off dictation and the sound came back on! I hope it helps some of you.
Currently Being ModeratedDec 6, 2012 4:04 AM (in response to ObiJuan2080)
I had this problem a while back, but it went away before I could work it out. It happened again today and I now believe it is a transient hardware issue in the headphone jack (possibly related to temperature/humidity/dust). The system seemed to get confused and think it was using digital audio out when it wasn't, and plugging in my headphones in a few times and twisting the jack a little seemed to make it the problem go away.
Similar description: http://forums.macrumors.com/showthread.php?t=1155397
Currently Being ModeratedDec 10, 2012 7:42 PM (in response to ObiJuan2080)
I just ran into the same problem as you. Nothing plugged into my iMac except power, kbd and mouse and for some reason I had no sound. Pressing volume up/down keys on the keyboard wouldn't do anything but show the "not permitted" circle with slash through it like the image in your original post.
I killed coreaudiod and after it restarted (automatically from launchd I presume) the sound was working fine!
A reboot might have fixed it, but killing coreaudiod was a lot quicker...
Currently Being ModeratedFeb 20, 2013 7:55 AM (in response to Dean Huxley)
I had this same issue...my iMac's sound just mysteriously stopped working. I went into System Preferences>Sound>Internal Speakers ....checked the mute button and then unchecked it and the sound magically came back....not sure what the deal was but it's working now.
Currently Being ModeratedFeb 28, 2013 11:30 AM (in response to ObiJuan2080)
I can't find 'coreaudiod' in the activity monitor or indeed anywhere on my Mac (21.5 inch mid 2011, OSX 10.8.2). Never had any sound problems on any revious mac until this one. Shop bought, not refurb. It worls fine with headphones but not without. The only options with the headphones out are: for output, Digital Out Digital-out port for which it says "The selcedt device has no output controls" and for input built in internal microphone and line ine audio line in port. The volume slider can be used but not input level or the mute button (unchecked) which are greyed out.
With headphones in, output changes automatically to headphones port and there are no other options. On the input tab the volume slider works for both input and output and the mute button can be accessed.
Nothinng else hooked up and iTunes works okay without headphones
This is driving me crazy