On Sun, Oct 18, 2009 at 2:29 PM, sumeet kumar
<[email protected]> wrote:
>
> After a clean install there is no sound in my system ( COMPAQ PRESARIO
> CQ 40-145 tu )

I've seen some (audio) chipsets which have a very low volume output.
I'll suggest connecting externally powered speakers to your laptop and
then checking. Also, make sure that you don't have the master output
and pcm muted. Set volume control with "alsamixer" in a terminal.

See if that helps.
Sharad

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