sound problems again :(

[Antonio Olivares]

Dear fellow testers,

The sound problems are back again.  I have no sound anymore :(

playing music from mplayer in CLI yeilds

AUDIO: 44100 Hz, 2 ch, s16le, 128.0 kbit/9.07% (ratio: 16000->176400)     
Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)    
==========================================================================
[AO_ALSA] alsa-lib: confmisc.c:768:(parse_card) cannot find card '0'      
[AO_ALSA] alsa-lib: conf.c:3513:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory                                  
[AO_ALSA] alsa-lib: confmisc.c:392:(snd_func_concat) error evaluating strings   
[AO_ALSA] alsa-lib: conf.c:3513:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory                                       
[AO_ALSA] alsa-lib: confmisc.c:1251:(snd_func_refer) error evaluating name      
[AO_ALSA] alsa-lib: conf.c:3513:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory                                        
[AO_ALSA] alsa-lib: conf.c:3985:(snd_config_expand) Evaluate error: No such file or directory                                                                   
[AO_ALSA] alsa-lib: pcm.c:2184:(snd_pcm_open_noupdate) Unknown PCM default      
[AO_ALSA] Playback open error: No such file or directory                        
Could not open/initialize audio device -> no sound.                             
Audio: no sound                                                                 
Video: no video  

Thanks in Advance,

Antonio