hello , this post must go in FAQ section

but somehow i do not have permissions to post in that section
so here i am posting in this section

my problem is i can't here sound from my system , before this i was running windows sp3 and i have run Ubuntu 10.4 for a quite long time and it was working fine with sound system but right naw i am running backtrack 5 Gnome/32-bit and i can't hear anything.

here are my information of lspci and dmesg

it was too big to be posted here so i used pastebin

if you could help me sort out this thing i'll be very thankful to you.