I had that issue when the DVD is not burned well, i mean... Everytime i pressed the rouch button(eject) my laptop freezed for about 5 secs but there were no disc out. The only way to eject the disc (when not responding) is restart the laptop and in the boot screen press the touch button. It worked everytime for me.
The problem is Alienware all have slot DVD drives, and so there is no eject button on the actual drive, or emergency eject hole in the drive. I hope my drive doesn't cause me grief. Otherwise my laptop will be just like my car. It has had my kids music CD stuck in there for the last 4 years now.
Try what i said.
Turn of the laptop and in the Boot screen press the touch button, it should eject the disc.
I know it is not a permanent solution, not even a good solution but is the only one i know :s Sorry but there is nothing i can do at the moment.
I'll try to find another way to fix that problem. I'm pretty sure there is a combination of keys to force the disc eject.