Tevion TDR5102 dvd record. "no disc"

I am stuck ! Would appreciate some help please on this " no disc" prob.
Just bought new fr Aldi - Australia. When it was first connected, played DVD original disc o.k. but now I do not know what to check, setup, menu or through source? When the original disc is inserted, it loads then “no disc”. I tried playing a copied disc and that was o.k. Any help? Am confused.