[ubuntu] playing DVD

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http://ubuntuforums.org – I am trying to figure out what is happening. I installed Ubuntu 12.04 on an external hard drive and tested it on two different machines for playing DVD. I use the same rented DVD from the neighbourhood video store. In one machine the DVD plays immediately while in the other it doesn't play but I can hear the dvd drive working hard grinding forever and the DVD doesn't even mount. The DVD drive in the second machine does work though because it can play unencrypted DVDs with no issues. Because of this experiment I think it is not that libdvdcss2 cannot crack the encryption but it is somehow ha (Hardware)