Hi my ipad 4 is stuck on icloud backup no matter how much times i press the ok button. It will not go away i have tried to power down but the slide button does not work because of the icloud popup. My home button is broken so cannot hard reset. When i plug it into my computer and use itunes it says please respond on your ipad but again the screen is locked by the icloud popup. I just charged the ipad so it is on 95%. I am trying to replace a cracked digitizer and broken home button. But cannot get the ipad to shut down. The only option i see is to let it discharge completely then reboot