My ipod isn't being recongized but charged

i've been to many sites trying to fix my problem none helped me.
okay so i have a mac book pro
ive updated everything in software update.
my ipod is being charged but not recongized by itunes!!!
and i ALREADY visited the apple website for help. nothing worked
please help!
I have a Mac OS X Version 10.6.8
also my itunes was fine before! i dont understand why im having this  problem
help
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Have you seen this article in particular.
Mac OS X v10.6: iOS device not recognized in iTunes after restart
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