No sound except for start chime... (iMac)

[tommaples]

Hi guys,
Yesterday I turned on my iMac and it played the start chime, but then I noticed it had stopped playing any other sound from any program.

It had been plugged into my TV via a Thunderbolt Cable the night before (this was still plugged in when I started it up) so I closed all programs, unplugged that, went to sound preferences and made sure 'internal speakers' was selected. Still no sound from any other program (itunes, etc) so I went for a restart as sometimes this happens (sound card getting confused? Who knows...) but the restart didn't work. I turned it completely off and then back on again just for luck but same problem.

The last thing I did was reset the PRAM, but that has done nothing too!

Any tips on what the problem might be??
Cheers,
Tom

 

[Fishrrman]

Check "sound" preference pane?
Check "Audio/Midi Setup" app (in the utilities folder)?

 

[vkd]

Hi guys,
Yesterday I turned on my iMac and it played the start chime, but then I noticed it had stopped playing any other sound from any program.

It had been plugged into my TV via a Thunderbolt Cable the night before (this was still plugged in when I started it up) so I closed all programs, unplugged that, went to sound preferences and made sure 'internal speakers' was selected. Still no sound from any other program (itunes, etc) so I went for a restart as sometimes this happens (sound card getting confused? Who knows...) but the restart didn't work. I turned it completely off and then back on again just for luck but same problem.

The last thing I did was reset the PRAM, but that has done nothing too!

Any tips on what the problem might be??
Cheers,
Tom

Perhaps you have a pair of headphones plugged in, or some other plug in the headphone socket?

 

[tommaples]

Check "sound" preference pane?
Check "Audio/Midi Setup" app (in the utilities folder)?

Hi thanks for replying - I've checked both of these and 'Built in output: Internal speakers' is showing up fine in both, just not playing any actual sound!
[doublepost=1519375273][/doublepost]Bit of an update on this - so now when I plug a set of headphones in, the sound comes out through those fine, once that happens I unplug them and the sound suddenly comes out of the speakers again! But then when I restart my machine (with nothing plugged into it) the sound is gone again until I repeat the headphones plug-in-and-unplug procedure!!

This will be super annoying to have to do every time I start up my machine, any idea what could be causing this and what the fix might be (aside from reinstalling the OS or something similarly brutal)?

 

[Wysardi]

go to activity monitor and do a search for coreaudiod in the processes. click on quit and it will automatically restart.