I have a problem with my build I have 6 RX580 8GB and the thermaltake 1200W Gold and H81 Pro BTC mobo. I had no problems when installing OS and all but when I plug in my GPU into the power supply the CPU won't boot. I've tried multiple different set ups and sometimes only 1 GPU will be running. I get 1 gpu to run while the others just turn on then of.. please need some help.