Dell Optiplex 760 no signal at output jack

One of our users sent us a ticket saying she cannot hear any sound from her speakers. The computer is a Dell Optiplex 760 (out of warranty). OS is Windows 7 Enterprise x64. Here are the observations.
1. The vu meter that appears when you click the speaker icon in the notifications area is showing sound level going up to the top when I run a video from youtube in Firefox. BTW, I do have the thumb on the speaker control all the way up.
2. If I click on "Mixer" at the bottom of the vu meter, Device and Firefox meters are both showing the audio and are hitting the top as well.
3. I looked at the driver for the SoundMAX Integrated Digital High Definition Audio in Device Manager, it showed no problems. I clicked "Update Driver" and chose "search online" and it said the latest driver is installed.
4. I disconnected the audio cable at the computer back panel, connected to my phone and played audio on the phone and could hear it through the speakers and could get it plenty loud enough.
5. The audio cable is connected to the correct connector on the computer back panel (the pastel green connector).
6. I opened the Control Panel app for SoundMAX Integrated Digital High Definition Audio. It only has a couple of off/on settings like "auto detect mic input (for mic or line)" and I tried both ways for both settings.

It seems that the problem is in the audio circuitry but that is integrated on the motherboard and since the box is out of warranty I don't have any recourse there.

Any ideas?
donanderAsked:
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donanderAuthor Commented:
I installed the Headphone/Mic/USB front panel board from another 760 and that fixed the problem. It seems I fixed this on my own but if any expert disagrees, I am happy to award points for an assist. Just let me know. If I don't hear back by Tuesday I'll request to close the question. Thanks, Don
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MikeIT ProfessionalCommented:
Try changing the speakers and let me know if you get the same results, even though your iPhone to speaker configuration works properly....
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donanderAuthor Commented:
It's an htc EVO but I'll definitely try your suggestion and let you know the result :-)
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nobusCommented:
since in 4- you can hear the sound, imo it is not the pc at fault,, but the speakers, as said
you can test also with earphone
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donanderAuthor Commented:
Sorry for the delay. The problem IS the headphone jack. Something is lodged in the jack. You cannot plug a connector into it. I believe it may be the end of a plug that came apart in the jack and the tip (of TRS) stayed in the jack. I am trying to get some time to take the machine to my bench to see if I can get it out. Alternatively I will take the heaphone/mic panel from an Optiplex 745 that is going to surplus and install it in the 760. I think they are the same.
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nobusCommented:
yes, that seems like a good solution; post results
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nobusCommented:
not at all; assign the points to yourself to close this
and enjoy!
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donanderAuthor Commented:
I found the solution on my own.
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