Joker,
Is your Drive still not able to burn the discs? If so then it sounds like you got a bad burner from shipping from MTU. These drives are tested, but they have been seen to be damaged in shipping at times.
Please check the Blink Codes located on Plextors Website and let me know what it states for you. Here is the link to the blink codes:
http://www.plextor.com/english/suppo...ink_atapi.html