Hi Trying to record from my stereo to my JE780 via the optical cable but I get the Din Unlock C17 error as soon as I press the record button. Cable at both ends is seated correctly and is working correctly as far as I know. Sony suggests a "power reset" but can't find how I do that. Also, the Optical In doesn't seem to have a red light which I guess is the nature of the error; is there a simple fix for this? Thanks in advance.