sound mysteriously not working

[Kevin Smith]

I had followed the handbook to configure sound (sound blaser Live!)  on 
my new 5.3 installation.  It was working yesterday but it doesn't work 
now.  Just to verify, I booted windows on the same system and the sound 
card/speakers are not working.

Here is my dmesg output and sndstat:

 > dmesg|fgrep pcm0
pcm0: <Creative EMU10K1> port 0xc800-0xc81f irq 18 at device 2.0 on pci2
pcm0: <TriTech TR28602 AC97 Codec>

/home/kevin> cat /dev/sndstat
FreeBSD Audio Driver (newpcm)
Installed devices:
pcm0: <Creative EMU10K1> at io 0xc800 irq 18 kld snd_emu10k1 (4p/2r/0v 
channels duplex default)

Any suggestions on what to try next ?

-Kevin