Sound not working in Ubuntu 9.04

[vishalaksha vyas]

I have HP Pavilion dv41131tx. Recently I have installed Ubuntu 9.04 on
it. There is no sound in any corner.
I tried with different options, installed/un-installed so many
plug-ins/packages. Also tried with alsa mixer to check something is mute or
not. Tried with different players. But not lucky at all. System is detecting
the sound card.  One thing I noticed that in so many post it was written to
check for PCM. I checked and found that I can not mute it unlike others.

Please any one provide me the any way to come out.
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