You may be using the wrong type of DVD format. Some DVD-ROMs and players will only read certain discs. i.e. DVD+R, DVD-R, DVD-RAM. If you are trying to read a DVD-R disc that was bought blank, and then had things burned to it, it may be that the disc wasn't finalised after burning. You could always try updating the Firmware version by downloading it from the website.
my lite on dvd rom drive doenot read any cd or dvd except the videostudio dvd that came along with...
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my lite on dvd rom drive doenot read any cd or dvd except the videostudio dvd that came along with the dvd drive