Left speaker on ALU 20 imac

I'm posting as I can't find a reason why / why not to my problem.
I am having an intermittent problem with an intel ALU imac. the left speaker keeps dropping it's main output.
Trying to find a source of the problem, I have:
Restarted - shutdown and restarted.
logged out and in
logged in as a different user
launched iChat (mic is in left speaker housing
checked all sound settings including midi settings in Utilities
I'm sure this is not a hardware problem ie blown speaker, as the is a little bit of sound when I change the balance to left channel.
And as I say it does come back..
Today it actually went off while I had NASA TV on in Safari (OK) then real player launched to play the ram file (NASA TV) when I heard the change.
if anyone has had the same problem and knows of a cure (other than external speakers or headphones) please post!
Thanks!

you could try a SMC reset and a NVRAM reset
http://support.apple.com/kb/HT1379
http://support.apple.com/kb/HT1411
If the above reset do not help, I would see if the issue happens with headphones. if the issue dose not happen with head phones, then you it is an issue with the speaker and you should seek service. http://www.apple.com/retail/geniusbar/

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Hello From Russia)) I bought Brand New Macbook pro 15" Late 2011 Ci7, this is incredible machine. But a month past and i started to notice a very strange behavior:
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I have seen this problem on the forum before, here is one instance: http://forums.creative.com/creativel....id=70289#M493
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Message Edited by aricjonho on 11-30-2005 07:02 PM

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