Hello Bhawani
Run the following command in a Terminal:

alsamixer

In this application, make sure to set all channels to high volume levels. Make 
sure the different speakers (especially 'Front', 'Master', and 'PCM") are NOT 
muted and NOT set to low volume levels in gnome-alsamixer. 
A channel is muted in alsamixer, if there is an "MM" under that specific 
channel/volume bar. 
Fabio

** Changed in: ubuntu
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/718165

Title:
  No Sound In Speaker System But Sound Plays In Headphone

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