yes ive checked and double checked, i only have voltage when the y-sus is plugged in via the ribbon to the control board.
it dosnt matter if i have anything else plugged or unplugged in.
i have tried without buffer connected and have replaced the buffer, ysus, control, and psu, with the very same effect.
when ribbon is connected the green led on the control board flashes slowly, every 4 seconds ?, when disconnected the green led flashes away normally