Imac's Sound and Mic stopped working!

Last night my Imac's sound stopped working. Internal speakers don't work, plugging in external speakers don't work. I thought this was just a hardware problem, but my internal mic also doesn't work, which is on the other side of the computer....
I've rebooted many times, cleared the pram, checked my preferences, played with the audio midi controls, plugged and unplugged the cord in the line out and did everything besides dance around the mac singing.
Any suggestions on how or why this would just stop working? It has to be something i'm missing, some setting.
I've downloaded Line In, didnt do anything. I downloaded Sunflower, didn't do anything.
The only thing I can think of is I just loaded Parallels and Win XP, but I just uninstalled it and still no solution.
Help please!!

ok let me help you with this process, go to the system preferences in your OSX go to the icon Sound click on it internal volume should be all the way up or mid high up Output volume either all the way up or mid way up thats in the input tab on the top. Now the output tab should the balance should be in the middle and output volume should be mid or all the way up . If that is not the case then there could be a hardware problem which I doubt because when the computer is off it creates a connection from line in to line out.

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I have done a fair bit of googling and had a look at the discussion history here but couldn't find a solution to my problem. Apology if it has been raised and discussed before and I woud appreciate being re-directed to the thread.
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Why?
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Last edited by whoops (2011-03-25 07:31:43)

Couldn't find any changes there:
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**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
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Last edited by whoops (2011-03-24 22:17:11)

Imac's Sound and Mic stopped working!

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