I have a Yamaha HTR-5960 receiver and was trying to plug in my DVD player to it using a TOS link optical cable, The dvd player is a Sony DVP-NC875V/B. For some reason I cannot plug in the cable either to the DVD player or the receiver. Am I missing something here, Do I have the wrong cable?. It simply will not go into the slot.. It appears to be the right size connector. It has a flat and round edge, So I am lining it up right.