原帖由： Dan ,
The PowerBooks require FireWire connections for external HD's that are bootable not USB connection. In addition, Target mode likewise needs to be connected via FireWire to the other system (USB connections won''t work). Let us know if you had tried a FireWire connection in either case. As to your optical drive it may just be some dust on the lens. Try a CD/DVD head cleaner which has a micro brush. It should clean the lens and allow you to boot up with the recovery CD the system came with. You could have an issue with the Leopard DVD as the optical drive on this system did not handle dual layer disks (Apple sold a CD version as well as a DVD version).