I used my B1 this morning to see whether it would play a -R disc. It did with no problems. This afternoon I find that it does not recognise any disc at all. Blu Ray, DVD, CD, it continues to show no disc on the display. When I insert a disc there is a grinding noise that happens two or three times, last for about 10 seconds in total before it fails to recognise the disc. I have just updated to the latest firmware, still no joy. Any suggestions?