Hi Michael Agronin
with the PSUs it is a pain 
The main problem is your PSU probably cannot deliver enough watts to the CPU or GPUs per power line ( from PSU )
Go to RECONSTRUCTION ->SETTINGS -> GPUs to CHOOSE button and deselect ONE or TWO GPUs and try to reconstruct it.
So what you can do if it is a PSU ? you could eventually use TWO PSUs in your PC ( is it possible ? ) or get more powerful 1500w PSU, or change the 980 for the new 1080 GPUs, as they need much lower wattage ( and you will even get significant speed-up )