Currently Being ModeratedFeb 5, 2014 1:21 AM (in response to Fisheagle13)
On the HD is one thing.
PROPERLY pointed to by the iTunes Music Library.xml and iTunes Library.itl files is another thing entirely.
If you've renamed or moved your music folder, however slightly, the XML file will no longer recognize the "location" on your iTunes files. Then the Library.itl file is useless.
Hold the Option key when you launch iTunes and re-select your library in its proper location.