The black spot on the LCD most likely was caused by something pressing on it just a little too hard. The spot may or may not go away. We have seen this quite a bit on cameras and LCD monitors. It is usually caused by finger pressure. It's just enough pressure to displace the liquid, but not enough to crack the screen. The camera should still be useable for the short term, but if the spot does not go away, or gets bigger, then a new screen it is.