I have an iPhone 4s that was dropped while in a case, and the screen went faulty but did not crack in any way. It just shows blue lines. Everything else appears to still work. This phone has a miniscule crack on the back glass from a while ago (<1cm on the the corner). I'm curious on opinions. Should I take this into the genius bar and see if they will replace it? Or should I just accept the fact that it was dropped and have the screen replaced.