I had my old iTunes library on an external when switching computers, and when I got my new MacBook, I just replaced the "iTunes" folder with the one from the external, and when I open iTunes, nothing shows up. I see the music in Finder, it's all there, and organized and everything. I've changed the directory many times, and reset it many times. I've Re-installed iTunes, and nothing ever shows up in the iTunes window. I've had the same problem tryin to run my iTunes library from the external. I did everything other people have in a different thread (make the root and alias from the external) but nothing happened there either. I thought maybe that it just wasn't accepting a root to the external, but after copying my whole library to the internal, and it's the same results, so either I'm missing something or something is wrong with my iTunes/computer.