[iTunes] inappropriate ! signs

[i.am.list.boy at gmail.com]

10.4.1
7.6.2

Sometime in the last week my Mac Mini shut down...

Its a repository for  a portion of songs in my Powerbook's iTunes  
library.
Now I'm stuck with all of these "!" signs, which are in fact  
inaccurate; when I doubleclick on one of these songs in iTunes, they  
will in fact play.

Anyway to, in batch, get iTunes to realize these are not in fact  
missing?
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