Two things worth trying to see if it clears this problem is (i) If you have the security code, "reboot" the system by disconnecting battery (or fuse) for 5 mins, replace then enter security code. (ii) Clean the laser by using a cleaning kit (Obtainable off Ebay or Maplins) This is basically a CD with a couple of bristle brushes plus cleaning solvent. Put a drop of solvent on the brushes, insert this cleaning CD and leave running. This cleans up the laser lens. If neither of the above work , then I don`t think there is any more that the amateur can do.
RegWorts, May 2008
