No sound on my mac book pro and now itunes does not play or any of my video or music files...

Hi
Can any one help was on the net and all of a sudden my macB pro has no sound and none of my music plays in itunes. went into the system pref under sound it shows that my output is empty and will not un mute1 please help
stuck in iraq1

I did try the PRAM reset several times but it appeared not to be working as when I went into info about my Mac it showed me 0 under Audio built in. I reinstalled the software update Mac os x 10.6.8 V1.1 from the apple site 2 days ago. Everything that was using audio had seemed to crash or not work all audio files, skype and itunes. When I switched on my bluetooth it would pick up my friend's pc and it would show the volume control was un muted and still no sound, I turned off the bluetooth and it would go back to being muted. I gave up and this morning miraculously it started up with sound as soon as I switched it on and everything seems to be working.
Thanks for the help and feed back
Sam

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