I just bought a Bayliner (first boat) and I took it to the lake today and went about 14 mins into riding it and I heard a big loud grinding, bang boom noise from the engine and then the engine winded out and I turned it off. Tried to start it again and started fine BUT WOULD NOT MOVE AT ALL. Was stuck in the middle of the lake with no paddle and no one around until a guy in a boat stopped about an hour later. But What Was That Loud Noise? My friend thinks it was the U joints.? If it was is it expensive to fix? What would you recommend? 