No sound ATI SB450 HDA Audio on fc8

[fitlad]

Hello everyone, I installed fc8 and everything is running properly except the sound card; there is no sound at all. The sound card is detected but no sound is coming out the speakers.
Vendor: ATI Technologies Inc
Model: SB450 HDA Audio
Module: snd-hda-intel
I searched the forum for a solution. I found some threads are posted already addressing the same problem but non of these threads were useful.
http://forums.fedoraforum.org/forum/showthread.php?t=166006&highlight=SB450+HDA+Audio
http://forums.fedoraforum.org/forum/showthread.php?t=157721&highlight=SB450+HDA+Audio
http://forums.fedoraforum.org/forum/showthread.php?t=147808&page=1&pp=15&highlight=SB450+HDA+Audio
Also, I attached some screenshots for the sound card specifications.

I tried to edit /etc/modprobe.conf using the root account but nothing happens.
alias eth0 8139too
alias scsi_hostadapter libata
alias scsi_hostadapter1 pata_atiixp
alias scsi_hostadapter2 sata_sil
alias eth1 ipw2200
alias snd-card-0 snd-hda-intel
options snd-card-0 index=0
options snd-hda-intel index=0

Please your help is appreciated.