My 2 month old Panasonic Blu-Ray DMPBD85EBK no longer recognises BluRays?

y 2 month old Panasonic Blu-Ray DMPBD85EBK no longer recognises BluRay discs. It is directly connected via a £50 1 metre HDMI cable to a quality Onkyo AV. It won't recognise any discs (inc DVDs) and states: "No Disc" or "unsupported format". It was working brilliantly for previous 2 months.