JVC RM-STHA25R Problem

Wondered if anyone can help me with a problem I have, I got a JVC DVD recorder, for no reason at all it will no longer play DVD discs it keeps coming up “no Disk” inserted, but yet it will play audio CD’s

I have tried numerous discs to try and play a film and still comes up with “no disk” Im not totally technical minded and wondered if anyone might be able to help me, my msn addy is barnsey_67@hotmail.com if someone can help

Many Thanks