Any ideas how to get my Computer to recognize my ipod

My computer randomly stopped recognizing my ipod and i dont know why. When I hock it to my computer it will start to charge but nothing will come up saying there is a divice and when i go to my computer its not there and its also not on itunes and its annoying me bc i just got a new cd and i cant download it can anyone help me. I have a 4th gen

http://support.apple.com/kb/ts1567
Basic troubleshooting steps  
17" 2.2GHz i7 Quad-Core MacBook Pro  8G RAM  750G HD + OCZ Vertex 3 SSD Boot HD 
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