if the dvd is not moving its likely that the belt has either come of the runner or it has snapped. dvd players from tesco can be as little as twenty quid and manufactures are less likely to worry about a repair. it would not be economic. top end models can be up to 300 pounds but unless you have a really new and expensive model i think youd be better off replacing it.. tho check the warranty first ay.
howard farmer, January 2008