I have a 15" PowerBook G4 1.33 Ghz and I discovered that the provided USB ports do not power such devices as portable hard drives or audio interfaces. So I heard that you need a POWERED USB hub. I get one, Plug it in. And the PowerBook still doesn't recognize my external hard drive. My hard drive has two wires on the opposite side from the enclosure that connect to female USB ports. I run an extension cord from one of the males to the other USB port on the PowerBook which is said to work but that also does nothing.. Disk Utility DOES recognize it. I can't find it in Finder, ...some Powerbook.. Any idea?