I HAVE searched for an answer to this but I can't seem to find one. I downloaded a live background and now my screens black. When i restart it, it does normal and I can unlock it like usual(swiping the puzzle piece into the slot) and then I see nothing. At the locked screen I can see that I've missed two calls,and I have an unread message. After I unlock it the background is black and I can't do anything. I can slide down the bar at the top and try opening my unread messages/missed calls but the screen goes back to black and I can slide it down again. Please help.