IMac will not play DVD Movies

I have a first generation iMac G5 (OS 10.4.11) with a "MATSHITA DVD-R UJ-825" drive which plays CD and software DVDs fine, but it will not play DVD Moives, burned or commercial. When inserted, they spin for a minute then I get an error message "The disk you inserted was not readable by this computer." But it should be.
I have tried updating firmware, but the update said I did not need it. Also tried deleting the "com.apple.DVDPlayer.plist" as suggested in an earlier post. Nothing has worked.
I had this problem years ago and have updated the system since but DVDs still will not play. Does anyone know how to fix this or download a new DVD driver?

I do have the exact same problem, but even worse: my superdrive won't even read a software DVD. I would like to upgrade to Leopard (I bought the upgrade DVD) and I can't read it. Is there a way either to make the superdrive work again by myself or use another computer's drive for this purpose (upgrade to Leopard)?
Thank you for your support.

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