Problem with my iTunes



Basically, i turned on my g5 a few days ago, and all the music i had put into playlists etc in iTunes, had gone. I still have all the songs on my computer, but for some reason it just got rid of everything in my iTunes library!
Is there a way of putting all the songs back into their playlists without having to type all the names etc out again?? Plus the songs are now on my iPod in their seperate playlists, so if i update my iPod, it's gonna update it with absolutely nothing :(

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