Weird sound output issue

Hi everyone,
my main problem this time is that I hear no sound coming from the internal speaker of my G4 MDD 1.25 dual.
I have read some othe topics and I have trash the prefs and did the trick with the mini jack.
I have also install 10.4.11 over my old 10.4.11 using a combo update.
No results at all.
In sound prefs "choose a device for sound output" I see only Headphones.
If I plug a mini jack on headphones then I see the Line Out option!
If I plug in headphones they work normally, except I see the Line out option and I can hear sound including the startup chime.
Thank you!!
Message was edited by: Yiannis

I dont have a front headphone jack because I have remove the FPB due to a problem that we have talked here.Still no solution to that too
http://discussions.apple.com/thread.jspa?messageID=12900293&#12900293
In the AudioMidi Setup I have the followings:
http://img408.imageshack.us/img408/3544/picture1xnn.png
Message was edited by: Yiannis

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