I am trying to charge/sync my iphone3 to my computer and all of a sudden it will not do either. It will charge from the wall. I tried a different cord. I have tried all 3 USB ports on my computer. My camera works on the same USB ports. When I bring itunes up it does not show my phone on the left side. Getting frustrated. I am not very tech smart so I would greatly appreciate any and all help but please use basic terms..lol. Oh and I have a new iphone 5 but can not get the little door thingy opened to install my new nanoSIM card...ugh!!