That's not very detailed.
You removed CSS encryption using the MactheRipper program as well, yes?
Did you open it in DVD Player using the File --> Open VIDEO_TS Folder... menu command?
Is the folder (it must be a folder, not a file) called VIDEO_TS with the underspace? If it's called anything else, DVD Player may not be able to open it properly (the folder containing all the video files needs to be called VIDEO_TS according to DVD video specifications).