Problem with my rig.

Hi guys. I transferred hiveos from my usb to ssd. It works. However. I have another problem. I have 2 corsair 850 w power supply. On one I have 3 gpu on the other just 1. I cannot put my other 2 gpu on it. I have no display and hiveos will not launch. It's work with 3 + 1 gpu. The risers are supplied by the 1st psu. Do I have to feed 3 risers with each psu? Or do you see something else to fix the problem? Thanks