No Sound From iMac Internal Speakers

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

I have now sorted this after trying various things and it is simply the headphone jack socket. If you have ever used headphones then this is the cause. Put the headphones back in and you will hear the sound. Waggle them around and then pull them out and the internal speakers will start working.

Then dont put your headphones back in!

Thanks. My workaround is slightly different. I've found that if I let the headphone jack stay in but loosen it then I can often get sound (though not always) directly. I must say though that this shouldn't be happening at all. When you fork out a fair sum of money for a computer then while you might expèct the odd glitch, not being able to hear any sound without some convoluted & distorted way of doing it, just doesn't seem right. Another problem, which I'm not sure is related to this or something else, is receiving what sounds like a submarine's sonar 'beep' on YouTube but not on iTunes.

This also worked for me on my imac - put headphone plug back in and wiggled it about - Hey Presto !

Bit crap really - but at least it's sorted.

didn't work for me... I went to system preferences and clicked internal mic.. still have mute mic on facetime connection even if I keep clicking it.. I will see if the VIDEO setting.. which comes up with FACETIME and has an option for internal mic works the next try. Very frustrating. As far as I recall the PREFERENCES under Facetime is grayed out.. so you don't get the option of preferences. I have all the right requirements for facetime.. and video is fine, plus audio from the contact.. but my side is eternally mute.

This happened to me when I placed the computer in "sleep" mode. When I brought it back to "active" there was no sound. Checked all of the sound settings and they were OK, restarted computer and sound was OK at that point. Somehow related to what happens when it goes into "sleep" mode.

On my 2013 iMac after about a year for some reason the right speaker seemed to stop working. After reading here I went into the system preferences and found that the balance moved to the far left (I didn`t do anything!). Moved it to center and all is back to normal. Still wondering how that happened but very glad it was a non issue.

Have iMac with most recent OS and all updates are done.

Internal speakers work on everything except iTunes?

Have Apple TV, and Bose Bluetooth Speaker...plus a few other Bluetooth items(all turned off and still no connection)?

Tried everything suggested previously in this discussion to no avail.

Is there a fix out there?

Thank you in advance.

Excellent! Worked for me, and didn't involve [very] heavy-handed resets.

Thanks!