Hi ..... I've got a mac G4 dual boot ( one of the last made before the G5), so it's way outside its warranty/support package. I've been trying today to register, finally, with garageband but it's not playing the game at all. It tells me - having suggested that an email address is the most usual form of Apple ID - that my address is invalid/not recognised. Any ideas of what I can do to get round this pesky little problem?