Did you try a different PSU? Coolermaster is rarely a brand you want on any electronics. Its quite possible that it could cause the miner to crash or damage hardware. Its also possible your controller just went dead.
OP do you have a link to PSU. But any 1000 watt should not have a issue. Might check with COOLERMASTER support as going from green to red does not sound good. Check the splicing honestly that was a pretty big mistake on a ATX. You should have got a switch.
But they make some really good cases. But I have not ever used their PSU's.
For starting an ATX psu, if you try another, make sure to connect the right pin. Its typically the greenwire and you can ground it with any black wire. If the wires are not color coded, just connect the 3rd and 4th pin.
The wires are always at the same place, you can know which side is which by looking at where the clamp is;