If you have an G4 or G5 and need to update or add a DVD burner you should visit Christian Moeller’s site in order to download a freeware patch called Patchburn. This software will allow your MAC to link to your new DVD burner. The majority of DVD burners do not have drivers that the MAC understands, that is why this software is a necessity. He has patches for Tiger (10.4), Panther (10.3), and Jaguar (10.2). If you have any questions regarding how to install he has a fantastic FAQ.