I have a 400Mhz G4 with 1GB of ram running Leopard. Works great except it does not play DVD's. When a DVD is inserted the following Error box is displayed: "A valid video device could not be found for playback. [-70017]" In addition, when trying to change screen savers, "Error: Can't load bundle" appears. Does anyone know of a work around for the DVD? Windows Media Player does not work and VLC will play only audio.