I've had the same problem...only restarts weren't helping. Instead, I opened Roxio Toast and waited for it to ask for a disc... when I complied, it worked just fine. Don't know if that's an every time thing, but I'll be happy with what I've got! There is a thead you might want to read through that helped me eliminate some possibles: "Pioneer DVR-109 == New SuperDrive?", in case it goes weird on you again.