Weird sound balance problem on Mac mini

I have a Mac mini that seems to have an audio output problem.    I have a known working cable (tested on another computer) plugged into the headphone jack.      If I slide the balance control all the way to the left or right, I get full volume.    If I put the balance control in the middle position, sound volume drops by about 90%.    

On the RCA side of the wire where it plugs into the stereo, I can pull the left channel and get full volume on right and vice versa.    When both jacks are plugged in, sound volume drops 90%.

I also reproduced the same problem using another cable.      

The system worked properly a few days ago as wired.     I have rebooted since this started.  

Any ideas?
Gary Fuqua, CISSPOwnerAsked:
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It sounds like it might be some sort of short inside the Mini.  You might want to open the machine up and do a visual inspection.

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Gary Fuqua, CISSPOwnerAuthor Commented:
I took the computer to Apple for repair.  
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