Every time I go into iTunes to try and burn an audio disk, I get a message saying that "The attempt to burn a disc failed. The device failed to calibrate the laser power level for this media." and the disc is ejected from the computer. I have no idea what has caused this problem (this didn't occur after any new installations of programs that I can remember or a re-formatting of the computer, etc) and when I try to use my external burner everything works fine. After this happened multiple times, I then tried to just burn a data disc with files from my computer, but the burn also immediatly fails and the disc is ejected. Anybody have some ideas/solutions?