Donkey Kong Country 2: Diddy's Kong Quest Q&A

Ok for those of you who have the super nintendo version plz help me! I don't know if it happens in the wii version! Ok Once on the the level that's right below the boss at the end of the level when i jumped on the target Diddy's radio turned gold and got a jew...

When I play this game with 2 players on my SNES,the screen turns black(and stays so) when I Complete a level in the "Lost World".This happened every time I was playing this game with a friend and nothing I tried worked.Does anyone know what I should do?