MV-1C audio causing video disruption?

[exomagnus]

FIXED Please DELETE

I just finished up my new mini-one slot Mvs project and I found something strange. When I plug the system into my Receiver the game has a horizontal video distortion but if I unplug the audio cables the distortion is gone. I have made systems using 2 and 4 slots before and never run into this. I know that the MV-1C only outputs mono so I wired it to have the same channel for the right and left audio output. When I hooked it up to my test speakers (some old powered computer speakers) there is no distortion. Is the sound coming of the MV-C1 more amplified causing the conflict with the receiver? I kinda puzzled by this so any thoughts would help, thanks.

 

[exomagnus]

update: There is no distortion when using RGB and the Receiver together just with the S-vid and Comp off the Jork. I have an external Jork that I hacked in a X-Box Av adaptor. The thing works fine with my other boards just not the MV-C1. I'm totally baffled.