no audio on Nvidia MCP51 HDA sound card

same problem
GOD, can you send anyone to help us, I really don't want my laptop to be mute.

I have exactly the same problem. I've done everything I've found on internet with no results...

something similar here. after a fresh reboot it seems i do have sound (login sound and stuff), but at some unknown point then the sound "get lost". no programm will be able to do sound anymore.

$ lspci | grep -i audio
00:10.1 Audio device: nVidia Corporation MCP51 High Definition Audio (rev a2)

$ lsmod

Module Size Used by
binfmt_misc 18572 1
bridge 63904 0
stp 11140 1 bridge
bnep 22912 2
input_polldev 12688 0
video 29204 0
output 11648 1 video
lp 19588 0
snd_hda_intel 557364 2
snd_pcm_oss 52352 0
snd_mixer_oss 24960 1 snd_pcm_oss
snd_pcm 99336 2 snd_hda_intel,snd_pcm_oss
snd_seq_dummy 11524 0
snd_seq_oss 41984 0
snd_seq_midi 15744 0
snd_rawmidi 33920 1 snd_seq_midi
snd_seq_midi_event 16512 2 snd_seq_oss,snd_seq_midi
snd_seq 66272 6 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
snd_timer 34064 2 snd_pcm,snd_seq
snd_seq_device 16276 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq
psmouse 64028 0
snd 78792 13 snd_hda_intel,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
soundcore 16800 1 snd
serio_raw 14468 0
i2c_nforce2 16136 0
pcspkr 11136 0
ppdev 16904 0
snd_page_alloc 18704 2 snd_hda_intel,snd_pcm
parport_pc 45096 1
parport 49584 3 lp,ppdev,parport_pc
nvidia 8132632 36
usb_storage 93888 0
ohci1394 42036 0
ieee1394 108288 1 ohci1394
forcedeth 68368 0
fbcon 49792 0
tileblit 11264 1 fbcon
font 17024 1 fbcon
bitblit 14464 1 fbcon
softcursor 10368 1 bitblit
$

for my case, meanwhile i found out in /var/log/syslog and /var/log/messages some entries that the pulseaudio daemon was no longer able to connect (to something) on startup. so somehow there been sound at the login-screen and successfull logon, but after that there been no sound anymore.

it seems the solution for this was, that i removed the all the "pulse" config files in my homedirectory ( rm -rf ~/pulse* ~/.pulse* )

this fixed the problem for me.

It take a long time .
To handle with this problem.
I could not fix it.
I had a same problem ( nVidia corporation MCP51)
My laptop model is ASUS A8Tc.

Maybe I reinstall to Vista CAN HANDLE IT !!

Deleting pulse files from my user folder (.pulse-cookie and .pulse) worked for me.
But, do I need to deleting them every time before I turn off??
Isn't a bug from pulse-audio??