ITunes music library has disapeared

I have a Mac mini with all my music stored on a Time Capsule. I've recently put the Mac mini to sleep but turned the TC off at the plug.
I've just gone to start up iTunes and now all the music has gone from my iTunes. It's still on my TC but the library is blank.
Could anyone tell me why?

try this:
quit iTunes
go to your iTunes folder (on the TC or your boot drive) and move the file called iTunes library to the desktop
open the folder previous iTunes libraries and find the iTunes library file with the latest date appended
move this file to the iTunes folder and rename it iTunes library (i.e. remove the date)
fire up iTunes while holding option (⌥), click on choose library when prompted, and the select the iTunes library file you just renamed

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