Repairing dvd?

My dvd now plays and records DVD-RW disc's ok, but will not play 'DVD VIDEO' disc's. I cannot enjoy watching my 'Schindler's List', 'Shawshank Redemption', 'A Bronx Tale' plus many more like I use to. The dvd recorder begins 'clicking' when I enter the disc and my TV screen eventually displays ' This disc cannot be played, please check the disc' .Can anyone help with this problem. Thankyou.