Won`t play dvd movies

hi all,
iv`e got a liteon dvdrw 1653s csop that has stopped playing dvd movies.
it will read and burn everything else but wont even spin up a movie(from a video library).it just clunks a few times then blinks twice x2. it used to play them but now ?

Are these discs heavy scratched? Maybe your drive is not able to read them because the disc is too much damaged or too dirty.

Try to clean discs and see if this solve.

no, they are all in good condition. i did try cleaning them but to no avail.
just wont play movie discs.
plays dvd games and dvdr,all cds just not movies.

If discs are scratched, probably the only solution is to use a different drive to read them.

Different drives have different error correction capabilities