Unable to hear any sound

[ebzzry]

I'm curious as to why can't I hear any sound coming from my speaker, even after doing the SOP for configuring the sound devices. The following text is my configuration:

$ cat /boot/loader.conf | grep snd_
snd_ich_load="YES"

$ kldstat | grep snd_
 3    1 0xc0d30000 6f88     snd_ich.ko

$ kldstat | grep sound
 4    2 0xc0d37000 4a5ac    sound.ko

$ cat /var/run/dmesg.boot | grep pcm
pcm0: <Intel ICH6 (82801FB)> port 0x5000-0x50ff,0x48c0-0x48ff mem 0xb0040800-0xb00409ff,0xb0040400-0xb00404ff irq 20 at device 30.2 on pci0
pcm0: [ITHREAD]
pcm0: <Avance Logic ALC250 AC97 Codec>

$ mixer
Mixer vol      is currently set to  75:75
Mixer pcm      is currently set to  75:75
Mixer speaker  is currently set to  75:75
Mixer line     is currently set to  75:75
Mixer mic      is currently set to   0:0
Mixer cd       is currently set to  75:75
Mixer rec      is currently set to   0:0
Mixer igain    is currently set to   0:0
Mixer ogain    is currently set to  50:50
Mixer line1    is currently set to  75:75
Mixer phin     is currently set to   0:0
Mixer phout    is currently set to   0:0
Recording source: mic

I've tried xmms, audacious, mpg123, and bmp but I still can't hear any sound from my speaker. What could be wrong? What am I missing?