Hi,
I also have a similar problem with my x51 for some reason it doesn't recognise that there is a disc inside the drive, meaning when I go to my computer there is no disc showing up and when I try to eject the disc via the eject button it will not eject the disc as it believes there is no disc inside.
I have tried a few options suggested throughout the forums such as updating and reinstalling the drivers but have had no luck. ( I'm not that knowledgeable when it comes to computers either). If anyone has a fix for this or could suggest anything that could help it would be much appreciated?