No sound from built-in audio device. I can only hear something from ear set. i checked Mixer ok

pavilion dv6
windows 7
no Sound
Nothign changed since I bought the machine on May 2011

1. Reset PRAM.  http://support.apple.com/kb/PH4405
2. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the appropriate method.

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    There are many possible causes for this issue. Take each of the following steps that you haven't already tried. Some may not apply to your model. Back up all data before making any changes.
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    http://ww2.cs.fsu.edu/~rosentha/linux/2.6.26.5/docs/DocBook/libata/ch07.html#excatATAbusErr wrote:
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