HT1338 No internal speaker device for sound output

HI,
I use a MacBook Pro and until today the sound worked fine. All of a suden the sound doesn't work, having checked the sound settings there is no option to select internal speakers the only available option is 'Optical digital out port'.
Any sugestions?
Thanks

Start your computer up in Safe Mode:
http://support.apple.com/kb/HT1455
Same problem? If NO, then restart normally, and look at your Login Items list here:
 > System Preferences > Login Items
Something in there is messing with your system. Try removing anything that you remember adding recently and restarting again.
If you're not sure, just make a copy of the whole list by taking a screenshot: hold down 'shift-command-4 and press the spacebar to highlight the window, then clikc your mouse or trackpad; the shot is on your desktop.
Next, select all and hit the '-' minus key at the bottom of the window.
Restart and see if the problem is solved. If so, start adding things from the list back in one at a time till you find the culprit (you'll have to restart after adding each one to test that).

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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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HT1338 No internal speaker device for sound output

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