Sound not working

[Pupeno]

Some days ago sound was working, today it isn't and I am tired of fighting X, 
so I don't know where to start solving this issue.
Amarok and alsaplayer seems to play but nothing is heard (like if volumes were 
down, but they aren't, they are all at full).
Now, let's get to the interesting error messages:
pupeno at plab:~/Examples$ aplay ubuntu\ Sax.ogg
ALSA lib pcm_direct.c:786:(snd_pcm_direct_initialize_slave) 
snd_pcm_hw_params_any failed
ALSA lib pcm_dmix.c:831:(snd_pcm_dmix_open) unable to initialize slave
aplay: main:544: audio open error: Invalid argument
pupeno at plab:~/Examples$ aplay -l ubuntu\ Sax.ogg
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

and now some data:

pupeno at plab:~/Examples$ lsmod | grep snd
snd_hda_intel          20468  1
snd_hda_codec         151056  1 snd_hda_intel
snd_pcm_oss            56448  0
snd_mixer_oss          20544  1 snd_pcm_oss
snd_pcm                96708  3 snd_hda_intel,snd_hda_codec,snd_pcm_oss
snd_timer              26884  1 snd_pcm
snd                    60004  8 
snd_hda_intel,snd_hda_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer
soundcore              10784  1 snd
snd_page_alloc         11304  2 snd_hda_intel,snd_pcm

pupeno at plab:~/Examples$ lspci | grep -i audio
0000:00:1b.0 0403: Intel Corporation 82801G (ICH7 Family) High Definition 
Audio Controller (rev 02)

Any clues about what might be wrong here ?
-- 
Pupeno <pupeno at pupeno.com> (http://pupeno.com)
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