I just got an iPod w/colour screen and I cant figure this out, when I look at my song list for my iPod, all of the songs are 'grayed' out and I cant click on them to play them, and next to the amount of space free at the bottom of the screen there is a small black padlock and I can't drag playlists from my hard drive to the iPod... but my iPod syncs with my library and when I look on my iPod, all of my songs are on it and I can play them like normal when it;'s not plugged into the mac