Hi, your going to need to give more info about your system, the OSX (Tiger?), the drive (SD and what speed), what iLife your using, what Toast (5, 6, 7) your using and if you've done any and all updates with the Apps. mentioned as well as the brand of dvd your trying to use with this. Also what type of dvd i.e. copyright won't work and will quit or never start the burn process 😉 However if it is from your own camcorder say, then we can move to the next step to help you burn what you need.