I recently bought a new 500GB WD external USB HDD, i partition 20GB out of it and installed 10.4.8. My dell 8600 inspiron has usb boot option in bios. Installation went well and when i reboot it got booted into mac but, i can has the welcome music and video is not working, i think i have to try and fix video problem, any suggestions?, but i think if you have usb boot option in bios it should work.