External sound output on Macbook Air stopped working

Two months ago, my Macbook Air went silent.
I tried every trick I was suggested, including upgrading to Mountain Lion OSx , after which sound came back for a few day then disappeared again.
Their is no external speakers listed under <system preferences / sound / output>
Internet is full of this complains, I mean it is not regional and limited to a particular version of hardware/software... complains are coming from everywhere across the world since 2008.
Unfortunately tech support at Apple appears to have no clue as neither hardware change nor software update / upgrade doesn't seem to solve the issue permanently. But they still replace parts and software for some reason, just to drive people crazy later.
I am confident that this issue has already been told to design team , the problem was known for years after all.
What is this? Does Apple expects people to trash their computers when this happens? and get a new one? Is this because Apple asks new customers if they want to recycle their old computers with them?
You probably think I am an Apple hater , I am not. I like their products but I hate their tech support, I am sick and tired of listening to so-called geniuses ,  bunch of untrained high school kids with a lot of BS.
Only hope I have left is, somehow, there maybe someone out there who already solved this problem... Are you there?
MacBook Air specs :
Processor  2.13 GHz Intel Core 2 Duo
Memory  2 GB 1067 MHz DDR3
Graphics  NVIDIA GeForce 9400M 256 MB
Software  OS X 10.8
Other Apple products I use together with this Mac :
Magic mouse
Apple TV latest
iPad latest
iPod touch 4th gen.

I finally found the solution,
the solution itself actually explains why Apple was so silent about this issue
because every macbook that was sold over the last 5 years was defective ,
it will probably cost Apple $100s of millions to recall them
It is the Audio Board Flex Cable, Part #: 922-8380
this cable goes bad quickly,
it is defective because this is strickly a design issue
I opened the macbook and replaced it myself,
all looks fine now

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