You may have a PowerBook G3 Series (Bronze keyboard) which does not have the DVD decoder installed. The PC card DVD decoder from the previous PowerBook G3 Series does not work on the PowerBook G3 Series (Bronze keyboard).

Though the DVD video PC card fits into the PC card slot in your new PowerBook, Apple does not provide support for that particular combination. There are no plans to make the DVD drive available as an upgrade from Apple. Third party companies may provide this capability but Apple is unaware of any at this time.