I have 3 external hard drives that I have recently reformatted on my Intel iMac as OS X Journaled extended. All of them are Firewire with one also having USB2. They all mount on my iMac, but when I attempt to mount them on my G4 iBook they won't. Only the one with both Firewire and USB will and only when both cables are connected. I have never had this problem until I reformatted the HD's the other day. I have checked the ownership permissions and do not think it is a faulty firewire port. Both macs run osx 10.4.11 and I am fairly knowledgeable with OS X, but can't figure this one out. One HD is still empty and the other two are almost full as I am cleaning out the computers and preparing to reformat them. Any suggestions?