Try to remote desktop to the computer. My 3xvega56 rig hangs instantly if i use my attached screen with the blockchain drivers, but if i remote desktop, it works.
5400 h/s +550 h/s for r1700 cpu at 650 watts total at the wall. I havent edited registry yet for proper undervolting, im sure i can get the powerdraw down a bit... (i hope)
/J