problem with desay ds-5701 dvd player
 

Was working fine, my neighbor gives me a dvd that he copied from dvd
recorder,I put it in unit, played fine. Took out dvd, now picture
vertically rolls, says 'loading 'even w no dvd in player. Did I damage
unit; it continually rolls and says loading when I turn it on; tv does
not roll vertically when playing it? Any advice would be appreciated.
Thank you.