iPad Air 2 running 8.1.1 I had mail open and was deleting all my mail in one account. I don't know what I did but the screen image changed. The font is bold and a little fuzzy. I turned it off. Now I can't turn it on. I don't hear the click when I open the smart cover. When I plug in the charger I don't get the 'ding' but the battery charges. I connected it to my PC and iTunes 'saw' it. So I did a full backup to the PC. Is there a hard reset procedure?