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Check that the burner is finalizing the discs. This can be set in Roxio or in the optical drive properties. In Windows 7, right click on the optical drive, choose Properties, then the Recording tab. Then the Global settings lets you choose to finalize the disc on eject. Try a different brand of DVD+R and check that the other players support DVD+R discs. (I know some DVD players only support DVD-R.)
most likely needs cleaning of the lens. If this has been done then realize that most branded dvd players will reject disc that are not original. Since you say all discs, I would have to say that it is in the lens, either dirty or needs replacement.
I my DVD-HR735 wont recognise any discs at times, and is getting worse. I've now discovered (out of frustration) that if I tip the front up to between 30-45 degrees, it will play all the discs it says were unreadable. I've started jamming three dvd boxes under the front of the machine when i want to play dvds.