Something strange happened. I was listening to a radio station and some of my music with iTunes, then I went away to have a phone call and after a while came back. The machine automatically put the black screen (sleep mode I think), and then I quit iTunes. However, after a few seconds the iTunes window opened again. I quit the program many times but the window keeps popping in. I don't just close it, as I said, I hit "Quit iTunes" but opens again automatically. How can I get rid of this? what could It be? It's a bit annoying, thanks