DVd Recorder will not read DVDs?

I have a Panasonic DVd recorder === DMR EX95VEBS==THe machine also has recording facilities on hard drive and video
A dvd symbol is continually on display
On placing a dvd in the drawer, the machine makes 6 "noises"-- As if it is trying to read the dvd - the dvd symbol flashes and the machine says "No read"
The tv screen says --"Cannot read , please check the disc"
Can anyone offer any advice ?