Itune won't recognize my music from my G drive. Help....

[Vangelis]

My new Mac mini Just had it's hard drive replaced. I've never put a single file or music folder on the Mini's internal drive so I assumed that when I reinstalled my G tech outboard drive back to my Mini it would see the outboard drive iTunes music folders just as it alway did, but it does not. In the advanced preferances I configured iTunes as I had before with the path of music folders selected to my G tech drive but now none of the music shows up in iTunes even though the files folders are intact as were before my my Mini crashed. Anyone that can share thier experinces with this issue would be apprecated.

Thanks,

Dave