My Iphone 4 would not connect to my computer?

Ok, my iphone 4 would not connect to my computer and either to my itunes, this is my Iphone Info:
IPHONE VERSION: 4.1 (8B117)
MODEL: MC31BLL

And my itunes version is 10 is the newest version i just download it from the store need help. The cable does work i just bought I'm really desperate an need help please.

Sometime error occurs in computers and sometime in Iphone so u update your itunes thats the reason when you will come back old verison of itunes then you will be access easily