No Audio Out Of Headphone Or External Audio Output Jacks

We have a Rev. B Bondi iMac that I recently put in my wife's 4th grade classroom for her to use. When trying to hook up external speakers I discovered there is no audio output from the side audio output jack or the front two headphone jacks when listening to the CD player. (I also checked using headphones)
The internal speakers sound fine and normal. I do hear something very distorted and weak from the external audio output jacks but it is so distorted the only way I can tell it is coming from the CD player is by pausing its playing. I have been into OS X now for about 15 months and am starting to forget everything I knew of OS 8.6 which is in the Bondi.
I checked the sound portion of the Monitors and Sound Control panel and all seems set correctly. Is there some other setting that I have forgotten? Any ideas/suggestions will be greatly appreciated.
TIA

Herb Mesler...
Other than exercising the jack-ports with a plug from a headphone, it may need some expensive repair. However I do have a trick for you to try first.
Here is my trick;
Computer must be off! Because there is some light voltage applied to the ports they can slightly arch, spoiling the trick. Arching is the root cause of electrical resistance thus not allowing for proper contact and sound will not pass through to the device.
Next take a plug "softly and full travel" through each port in the side and on the front. I repeat them about 5 times. (any proper spec/type of plug, like from a headphone can work. If it from something that is powered, like from speakers, do not use it)
Boot up the computer and test by avoiding the side ports, using only the front ports. Quite frankly I found the use of the side ports to be somewhat the cause of the problem. Mine has been taped off for about 6 years now and I never have had to repeat my trick to date.
Give it a try and post back if there is any questions. Also, I would like to hear your results.
...Ron

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1. Headphone/optical digital [S/PDIF] audio out:
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"PCM: 16, 20, or 24 bits per sample at sample rates of 44.1 kHz, 48 kHz, or 96 kHz
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As a side note, can anyone tell me -- perhaps the elusive and chimerical, but omniscient and omnipotent "communityhosts" of Apple.com -- why, in my original post in this thread, the phrase "1. Headphone/optical digital S/PDIF audio out" had the acronym "S/PDIF" stricken through, like it was a particularly egregious Anglo-Saxonism? Wikipedia defines the acronym thus: "S/PDIF is a data link layer protocol and a set of physical layer specifications for carrying digital audio signals between devices and components over either optical or electrical cable. The name stands for Sony/Philips Digital Interconnect Format."
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It seems unfair.

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If the Pro speaker's jack or plug is not firmly seated, the external Apple speakers
will not work. And if the port or plug is damaged, they probably won't show or work.
I have a few of these iMac G4 1.25 17" computers with the Pro original speakers and
the port they use is a specialized and marginal one. It is possible the plug is not in
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Not sure if the standard Apple Hardware Test included with the computer could have
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And if both the standard mini audio port and the Apple pro speaker port both fail to
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For some applications, there had been a special audio adapter where the Pro speakers
could be used with other Apple computers, but these speakers require amplification
and a standard speaker jack by itself does not support that kind of audio power output.
Hopefully this helps somewhat...
Good luck & happy computing!

Audio out line problem

Are 6 year that there is this problem on all mac book pro i tried.
After stanby (closing monitor) external audio out line (headphone) never works!!! why?
I need to restart mac and after all works well...

Sounds like your coreaudio needs to be restarted. I don't know what's causing that, probably some software conflict. Is there some app that you have been using on all of those macs? For example, have you got some AV utility, MacKeeper or something else that runs at login on all those machines?
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Audio out?

MacBook
Mavericks
In System Preferences, Sound, I only have an optical digital out with the red light showing through the headphone port.
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Thanks

There's a tiny switch in the headphone jack that's supposed to switch it between analog and digital. If it's stuck, sometimes plugging and unplugging a set of headphones can unstick it.

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First I apologize if this has been adressed elsewhere.
I am using an HP PC Monitor w/o speakers but with audio output to mini jack(headphones).
My ATV2 has HDMI out to DVI in on monitor, hence no sound transfer. Computer has no optical audio in/out, so how do I send audio to computer to play through computer-based 5.1 speaker system, also with no optical audio in/output.
Re-cap: AppleTV2 HDMI out to Monitor DVI in, lost sound. Cannot use optical audio out for sound, and although I believe original version of AppleTV had composite out, ATV2 only has HDMI, optical audio ports.
How do I send audio to computer, running Windows Media Center Edition, not using HDMI, since that is adapted for DVI which is only input available for my monitor.
I hope this makes sense to you all and I hope I have included all pertinent information. I await, patiently, any and all help provided, with great thanks for taking time to read this request.

You're stuck really - as you say AppleTV2 does not have analogue audio out, DVI does not support audio, and AppleTV is not officially compatible with DVI though may work.
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Why does the monitor have audio output socket if it can't handle audio input, or does it have a separate audio in socket?
AC

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