Please help, we have an iPhone that displays a message to connect to iTunes but when I connect it to the computer it says USB device not recognized! I know the cord is fine because we use it on 2 other iPhones for updating and backing up. I have tried other cords though, same results! It says it can only be used for emergency calls, I changed sims with no luck at all. It charges fine in an outlet but not on the computer. The home button also does not work! Any ideas??