I am trying to resurrect my wife's old PowerBook G4 (aluminum). The hard drive crashed and I replaced it with a new one (following some very good instructions on youtube). The machine now goes to a grey screen with a "?" and the mac face logo alternating on a folder icon. I believe this means it does not have an operating system. I tried to boot from the OS X (ver 10.1), OS9 and the PowerBook G4 software install disks she gave me and I end up in the same place: flashing ? and mac smile logo. The machine does not want to boot from the disks. What do i do next?