ITunes can't locate ⅔ of my Music Library -- How to repair?

Question

I manually reorganized the iTunes Media Folder on my MacBook Air because everything was all jumbled up in the Music folder -- Songs, Movies, Mobile apps etc. everything all mixed up in Music folder. I manually dragged the Movie, iTunes U, Mobile Applications  etc.Folders out of Music Folder and put everything into iTunes Media Folder. The same order as it is on my desktop iMac. Now iTunes can't locate about 1/2 of my Music library. Everything else (movies, TV shows etc.) works fine, but iTunes lost the location of 1/2my music library. I get the message "The song "ABC" could not be used because the original file could not be located. Would you like to locate it"
Is there a way to reset iTunes so that it knows where all the songs are (they are all in the music folder which is in the iTunes Media Folder). If I have to locate every song individually it will take weeks. 
File ->Library ->  Organize Library -> click Consolidate and Reorganize files in iTunes Media didn't seem to work. Isn't this the way to let iTunes know where all those songs it can't locate are?
Kindly advise if you know how to slove this.
Thank you.
P.S. Still using Mountain Lion on this computer

Answer 1

I manage my music manually by turning off the advanced preferences for iTunes managing my music and copying it to the iTunes folder when adding it to the library.  Realize if you do this you are taking responsibility for keeping track of your music -- you will have to be organized.  If you want to move your library you will have to track down all the files. Your files will retain their original names and folder names and structure, so make sure it makes sense.  There's a few other disadvantages which I can't remember right now.  Even with manually managing you still occasionally get a broken link, and my experience is all with iTunes 7.5 which I still use.  I may be wrong but I suspect newer versions of iTunes are trying to do more at one time with all the store and cloud interface and may be more "delicate".
If you are downloading from Apple or ripping a CD, iTunes will put it in its normal folder structure anyway, though you can remove it from there.
The various scripts on the Dougscripts web site were written at different stages.  You have to read about iTunes version compatibility in the blurb about each script.  I don't see how you end up with multiple libraries using hte scripts.
The .itl file can reset itself but not with what you are doing.  If you had moved your whole library and broken all the links you could have found just one and iTunes might have offered to find the others based upon the same structure (not something it will do if you manually manage, by the way).