After hooking up new DENON AVR1910 I am unable to get either TV or DVD (Blu-Ray) sound when using HDMI's from the cable box and the DVD to the DENON and an HDMI from DENON to TV. I CAN get sound to TV only by running the HDMI directly from cable box to TV. A cable tech advised running an optical audio cable from both my cable box and Blu-Ray player to the DENON. Appreciate any help and welcome comments. Thanks.