Last night my iPad mini worked fine. This morning it won't turn on. I pressed the home button, I held the lock button for a long time, I held the home button and the lock button together, I plugged it into the charger, I plugged it into my computer as if to sync it with iTunes, - nothing. Blank screen. It didn't show up on iTunes either. I did update to iOS 8 a week or so ago but everything seemed fine. I was installing an app last night but put it down before checking that it had installed. Any ideas?