today i took it to istyle and tried a new baterry but they said that it didnt turn on
but i bought a new original usb cable the before cable which i used was a cheap usb it can connect many phones
the story is that when i connect the iphone to the computer with the cheap cable it gives a sound of connection
but when i connect it with the original usb cable no connection happened.
i tried the original cable with the ipad 2 and father's iphone 4 and worked.