i have a green machine model c6415. i had no problems until recently. i was burning a audio cd on nero when it quit about 80% in the process. since then my drive will not read or acknowledge audio or data cd,s. it will play dvd,s with no problem. with all i've read on this forum i think the drive is shot. my problem is that i have'nt a clue for a replacment. the current model drive is, nec dvd-rwnd-3540a. after all that i've read on this forum i'd rather go with some other unit. but which one? please advise. thanks jgoodmech.