I bought the retail version PX-760A a month ago. It performed as I've expected, wrote DVDs with good quality, read damaged audio CDs better that my other burner or standalone player (Tascam/Teac). Until now.
A week ago my Plextor started to reject DVDs it had just written. At the same time I continued to successfully burn other DVDs with that drive and these discs read OK in my NEC ND-4551. At this moment the Plextor won't recognize both written and blank DVDs, but continues to read CDs.
Plextools won't allow me to do anything to the drive as if it was empty. (I expected to 'reboot' the drive in Plextools.)
I have not performed any modifications to the drive. I decided to flash the deprotected firmware only if I really needed it.
Orange led light blinking 2 times (Auto adjustment failed). Windows shows "The request could not be performed because of an I/O device error." The only 'solutions' on the windows part are to work in PIO mode.
The causes of these errors appear conflicting, one tells of a problem inside the drive, other suggests noisy communication with the motherboard.