How to get batch recognition of (!) on some tracks after moving library from external hard drive to new iMac (with terabyte hard drive)?

Question

I'm using Lion 10.7.2 and iTunes 10.5.2
I have moved my iTunes music from an external hard drive onto my new iMac (with a terabyte hard drive) with music folder organized - when I try to play some tracks I get the iTunes can't locate warning and so I follow through and show iTunes the track - they are all in the music folder on my iMac hard drive - they all copied over and they all appear in the iTunes library list - so far as I can tell out of a 500 gigabyte music collection - but there are so many giving me the error - many other tracks function as they should too, some work others don't - So I'm looking for a way to get all the error tracks fixed in a batch correction way. Doing this individually with each track just isn't realistic.
Can anyone suggest how I might fix this issue?
Also, after I show iTunes the song location and it plays, I get a find files prompt that looks like it wants to find other files, but that just causes the process to jam and I have to force quit iTunes and then it doesn't remember what I last showed it next time I open iTunes.
Also I'm trying to avoid the use of the consolidate function because that would copy a whole other set of music - not in iTunes - that is in the process of being edited (audio hijack pro and fission tools being used to put vinyl and tapes to mp3) But all that other music just means the consolodate function across my whole computer would be too much.

Answer 1

Some details seem to be coming into focus - I have started scrolling through the main library list A to Z repairing tracks individually (there are thousands, but it's what works so far) - as I work through, it appears the problem occurred on tracks where album artist metadata was different than song artist metadata, predominantly. I'm not sure that is 100% the case in every instance, but that is what it's looking like. I don't why that happened, must be some technical glich I guess.
Also, I tried running Doug's Scripts - the one titled, iTunes Track CPR v1.3 - it is supposed to fix exactly the kind of issue I'm having - I bet it would work for some people with a similar issue - but for my case it only identifies the 'de-linked' tracks and doesn't repair them - that is at least helpful as I scroll though to fix them - I can see exactly which tracks have the issue quickly after running that script - but iTunes doesn't remember that warning symbol after a log-out, so it's only worth running the script on a set of tracks I intend to review and fix in any given session at a time.
If you are interested, Doug's free scripts can be found at
http://dougscripts.com/itunes/scripts/ss.php?sp=itunestrackcpr
there are other interesting and useful iTunes scripts there too...
also, unrelated to the issue I'm having, I found a lot of really useful and time saving metadata fixing free scripts at - hubi's iTunes scripts - the page isn't English, but the script download is easy to find -
hubi's scripts work for batch selections of tracks - so if you import an album and find the metadata screwed up somehow, you can select the whole set of screwed up tags at once (even across a series of albums), run the easy to use script, and watch it all be fixed automatically while you sit back and relax...
http://hubionmac.com/wordpress/category/softwareschmiede/applescripting/itunes/
just for reference, here is a sampling of what hubi's scripts can do...
there are other useful scripts out there - the tough part can be finding the one that helps you...
01-(un)capitalizes
01-(un)capitalizes
This script changes.... THIS TEXT into This Text... or this text
01-Delete spaces
Sometimes invisible blanks are behind an artist name or album name...this script deletes these blanks behind or infront of the strings
01-Delete x first-last chars. of Title
A Name like "01--Ray Of Light" will be changed to "Ray Of Light" and the01 will be entered in the tracks tracknumber id3 field =)
01-fix combined Artist-Title
Sometimes Tracknames look like:
"Madonna---Ray of Light" and in the artist field you see something like"Ripped by Me"... this script puts Madonna back to the right field... all youhave to do is to enter the right delimiter ("---" in this case)
01-switch Artist<->Title...
Switch ID3 field a with ID3 field b (not only Artist with Title any more =)!
01-z_filename ->Title
Sets the ID3 field Title to the track's filename)
01-z_trackNr-Filename->ID3
When a track's filename look like "01-Madonna-Ray of Light.mp3" andyou don't have the track's tracknumber stored in the ID3 Tag... this Scriptcan do this for your =)