When I plug the Kindle PW into my Mac, it shows up on my Desktop as a USB volume named "Kindle"... if yours isn't doing the same, I would suspect a problem with the USB port (have you tried more than one?).
When I plug the Kindle PW into my Mac, it shows up on my Desktop as a USB volume named "Kindle"... if yours isn't doing the same, I would suspect a problem with the USB port (have you tried more than one?).