also when looking through alsamixer the display is showing for playback options 
. 
       < Master >             PCM              Line In           Mic Boost      
     Beep             Internal        
where (master & beep) are mutable.. cant see how mic boost can be a playback 
option.. 
do you think it could be a external amp not turned on for the speaker ?

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acer 7720g laptop 3 spkr's 3rd being sub woofer not working 
https://bugs.launchpad.net/bugs/516725
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