It's not a re-import is it? If so it might not be set up for European DVDs.
If that's not your problem then load and eject a disc and see if it has rotated. If not then the player is knackered.
If it's spinning then try loading a cleaning disc to clean the lens.
If that doesn't work then your fooked.
Oh, by the way, welcome to LandyZone. Nice of you to introduce yourself in the section specially set up for that.