My 16GB Wifi iPad rMini fails to reach the home screen whenever it is switched on. When I power up the device it goes through the normal sequence of showing the Apple white screen and the Slide-to-Unlock screen, however, it instantly turns off and repeats the sequence of the white screen and the unlock screen. This prevents me from accessing the iPad completely. It sometimes gets stuck on the white screen wherein I can take a screen shot and even acces Siri. I've tried holding the home and the lock button until it completely restarts, however, it has not solved my issue despite numerous attempts. I've also tried restoring it to factory settings through iTunes, but it prompts me to turn off my iCloud from my iPad, an impossible task to do with an inaccesible iPad. I am going to have it serviced at an Apple Store since it is stil in warranty. If they opt to give me a replacement iPad, I'd like to know if there is a way to ensure that all of my information, files, and paswords from the iPad is completely erased from the machine. Thanks!