goodmans gdvd84wlcd wrong disk error?

got a goodmans gdvd84wlcd watched around 3 movies in total packed it away in case got back out next day now says wrong disk dont have a clue whats wrong its only been used for less then 3 hours tryed over 75dvd cds mp3 cds ps2 games the lot see what happens scans for ages says loading... then about a min or 2 says wrong disk cleaned lazer all dvd are mint con not a mark can any body help