I just got a pretty nice old PowerBook G4 with OSX 10.5.8. It hasn't been used too much and after a few days, the hard drive decided to start saying "goodbye". I have an extra drive here and put it in my external enclosure, went to disk utilities, erased it and used "restore" to clone it. The new hard drive won't show in as a start disk, internal or external. What am I missing? I realize approaching this with Windows PC logic will just get me into trouble so I'm gonna need some help, please!