When using iTunes, some Apple fans may encounter the problem below. That is the iOS devices (iPhone/iPad/iPod) cannot be recognized after they connect them to the computer, and the sound of charging occurs continually.
Here are some solutions.
1.Quit and relaunch iTunes
2.Connect iPhone/iPad/iPod to other USB ports to the same computer
3.Reboot the iPhone, iPad, iPod: Hold down "Power" button and "Home" button at the same time until the Apple logo appears
4.Restart computer
5.Use another USB cable
However, if the solutions above-mentioned don't work, there may be some other problems in iTunes itself so that it makes the iPhone/iPad/iPod unrecognizable. Under such circumstances, don't lose heart! What you need to do is to reinstall iTunes. Please follow the steps to complete the installation.
First of all, delete iTunes and its related softwares. Take Windows 7 for example. Having entering the control panel, please follow the following order.
1.iTunes
2.QuickTime
3.Apple Software Update
4.Apple Mobile Device Support
5.Bonjour
6.Apple Application Support
Secondly, reinstall the latest version of iTunes. Please download it in Apple's official website: http://www.apple.com/itunes/
If your iOS devices still can not be detected in iTunes, please connect the iPhone/iPad/iPod to another computer. It may be the problem of the hardware of your iPhone/iPad/iPod while other computers can recognize them. Don't hesitate to contact Apple Inc. to repair your iPhone/iPad/iPod.