My audio/sound has been erratic for a while and now I have no output Help!

My audio/sound has been erratic for a while, both output and input, sometimes one would worked but not the other and sometimes both would be none excitant.
System preference does not show what I have connected aka external speakers or headset and the sound output in menu is grayed plus the output on system preferences output as well, sound input looks ok now.
Had Tiger, so I upgraded to Leopard to see if that would helped, Output use to come back after a while, however now input works but output hasn't worked for days, I can hear sound when I am rebooting or starting the computer, but its gone right after.
Since the Mac its fame for their audio stability, no ones seem to know how to solve the problem, so I am kinda desperate.
I have tried the following; ran repair permissions, looked for fluff lol!....still cannot fix the glitch. Any new ideas please!!
Thanks in advance!

Since the problem existed before installing Leopard, it is clearly a hardware problem. Updating a broken system does not fix it, in fact many times it makes it worse or at least harder to diagnose.
I suggest you repost in the appropriate hardware forum - in your case the G4-17 forum(s) here:
http://discussions.apple.com/forum.jspa?forumID=1022
and the general G4-17 forum here:
http://discussions.apple.com/category.jspa?categoryID=138

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