Audio don't work and lighted red light

I am having a problem that is leaving worried me. Mine iMac MC309BZ/A, simply stopped to function the sound. I verified and the red light is lighted in the output of audio. The stranger is that, aproximadamente the 7 hours before, I assisted a film and functioned normally, without problems some. The sound icon is grey. Another strange thing is that when I bind, it touches the opening sound. What it makes me to think that the problem is not in the hardware. Already I made reset in the NVRAM and the PRAM.
From now I am thankful.

Hello,
Long shot, but...
Open Audio Midi Setup in Applications>Utilities, see the input & output options & KHz setting there, some things will change it for their own use, then not set it back

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