DVD won't be read until its end

Hello ,
I have a iMac G5 intel , and while trying to watch a DVD movie , it stopped about 30 minutes before the end . The disk seems clean and without any scratch.
Trying to re-enter the DVD and select the chapter , I showed a black screen while the DVD counter continued running .
Any advice please ?
iMac 2Ghz Intel Core duo /2Go   Mac OS X (10.4.7)  

I have heard of this issue from sub standard or excesivly used DVD's ie Rented movies. Also, you touched on the other cause of dirt or scratches. this is normally the only cause of this problem.
If you have a DVD that you know there is not an issue with like a brand new one you just purchased play it and it will answer the the question for you that it is more than likely a bad DVD.
Cheers Don

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