I bought a new external hard drive and when I connect it to the USB port, the icon does not appear on the desktop. The power is on. I checked the disk utility and it reads the external as being connected. I connected it to a PC and it worked fine. I checked the requirements and it is compatible with my OS. I am running a Power Mac G4 on OS 10.2.8 (I know it's old, but it stills runs good) Any suggestions?