[ubuntu] CD Drive Problem: Won't play discs

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http://ubuntuforums.org – I am having problems playing DVDs and CDs on my 9.10. I had this problem before when I had Ubuntu mounted as an application on top of Vista, but after I went to a full partition, the solution I had found got lost in the reinstall. If I remember correctly, it was one line of code in terminal that fixed the problem. Basically, I can put a DVD in the drive and it is recognized by Open Mediaplayer. As soon as I try to play it, the player's window opens, and then immediately closes. Also, the CD must be ejected with sudo eject (the button doesn't work anymore). The drive appears to be mounted (Hardware)