Sound system broken ---- HELP!!

[rocketking]

I was watching a movie using mplayer. When the first clip finished and switched to the second clip, the sound is gone. There was no error message, and no any indication of any problems. So I reboot the system, the problem remains. The /dev/dsp, and /dev/sound/dsp are both there. However /dev/sound/dsp is displayed in a blackbox with yellow text, I'm not sure if it is normal.

When I try to play any music, it will play as if the system has no problem, but just without sound.

I thought probably the sound card or the speaker is broken, but when I loaded Knoppix I can play music with it.

I turned all the bars in the alsamixer up, still no sound.

I used alsaconfig, it says "No supported PnP or PCI card found". I'm no sure if it means sound card, but when I use lspci I can see my sound card is 00:1f.5 Multimedia audio controller: Intel Corporation 82801CA/CAM AC'97 Audio Controller (rev 01)

The ALSA I used was the one that compiled in kernel.

Also, there is no error message in log file.

So basically everything work fine as if there is sound, but there is no sound. So something is broken while I was watching the movie?
Anybody have any clue about this? If you need any more information, please ask.

Thank you.

[bemis]

if i were to venture a guess i'd say that something else was trying to use your soundcard at the same time (the intel cards don't deal with multiple streams very well if memory serves) - alsamixer shows that all your volume settings are correct and none of them are muted? do you run alsa or esound? does it matter if you use the alsa or oss driver to access your sound card?
_________________
Y'know, somewhere along the line, my brain got wired directly to my fingers .. I'm not even consulted anymore in the decision making processes.
-bemis

[Jykke]

Have you tried alsaconf?

aplay -l should list your cards

you can also try to check with cat /proc/asound/cards if something abnormal
is showing or missing. I don't remember right now at this second but there was also
/proc/asound/devices (ALSA howto has the commands)

Have you custom made ~/.asoundrc or /etc/asound.conf ?

[rocketking]