Just got back from a three day trip and after I opened iTunes and started trying to play some of the songs in my library for each one I get a prompt stating that iTunes cannot locate the song and if I'd like to locate it manually. This comes after I just moved my entire library over to an external hard drive because it was taking up too much space on my iMac's HDD. If I locate the song manually there is no problem but there's no way I'm going to do that more than 1,000 times. Does anyone have any ideas? My external HDD is connected and the songs are there---I can get it to work if I locate them manually---but why is this happening? And for the record, I have it set to the location on my external HDD in the advanced setting of the preferences of iTunes so that shouldn't be the problem.