I have a PowerMac G4 with a Pioneer DVR-103 DVD-R/RW. I've been using it happily ever since I bought it. Just recently I was authoring a DVD out of DVD Studio Pro and it gave me a device error. Now nothing will work. I can't even burn data DVD's out of Toast. I can still burn CD's fine, and it read DVD's most of the time. I tried running the Tech Tools Pro driver test over it and it crashed the program. Now I'm out of ideas.