I was recently given an a MAC Powerbook G4 I'm trying to load Leopard OS on it, the hard drive has been formatted using MacDrive 8. I also have an bootable usb with leopard on it, I checked through MacDrive 8. I plugged the usb in, held the option key down and started the machine, nothing happen the desktop is showing a refresh arrow and a directional arrow, the usb data light is just flashing. What should I do to correct this?