Sound Speakers are not working! Not allowed to control the volume! Why?

Hello,
Digital Output is not working on my iMac PowerPC G5 with Tiger. Suddenly, sound disappear and I was not allowed to turn on the volume through the keyboard buttons; a "not allowed" icon confirms that.
First I thought It was because Perian, Quicktime plugins, libraries, etc as I have read searching on these forums but I have just installed Mac OS X from the default install disc after formatting but the problem is not solved!
Speakers do not work but headphones and airtunes do.
Did the iMac Sound Speakers die?
Help me, please!

Imac G5 OS10.5.3
I have the same problem but with a twist:
In system preferences:
Under sound:
Output selected:
Under name: Digital out
Under type: Built in audio
Below that : settings for selected device
It says:The selected device has no output controls
It won't let me adjust the audio up or down, no sound.
I can hear the chime when the computer comes on, though.

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