Mac G4 won't read finalized DVD-r

I need to view/edit a finalized DVD-r on my Mac G4. The problem is when I place the DVD-r in the G4 cd/dvd drive the system ejects the DVD-r. So for whatever reason the G4 running os 9.2.2 won't mount the DVD-r on the desktop.
The cd/dvd drive will read all other cd's (audio) or dvd's
(movie's).
The DVD-r was created on a stand alone DVD recorder and is original content.
Any ideas??
Power Mac G4 450 Mhz   Mac OS 9.2.x   Memory 385 MB
Power Mac G4 450 Mhz   Mac OS 9.2.x   Memory 385 MB

When the dvd-r is finalized on the Samsung dvd Recorder the mode is automatically set to video - so that it should be playable on any dvd player. Samsung Tech support said to try the finalized dvd-r on a PC since the dvd-r played/viewable on two stand alone dvd players.
At this point I don't know what to do! The dvd player on the mac ejects the dvd-r almost as soon as the door closed.
Power Mac G4 450 Mhz   Mac OS 9.2.x   Memory 385 MB

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