I think when you fried your PSU and you plugged it into your R4E that you may have caused some damage to the board, from the sounds of it. I just hope when you had everything plugged into it that it also didn't cause any further damage to any of your other components. I would check and test each component on another rig if you have one.
I would try this. Take out the CMOS battery, plug everything from the mobo, no power nothing, not even the CMOS battery. Then press the START button the R4E to try and start the motherboard with no power. It should drain out any remaining power and reset the board completely. There maybe some jumper settings you need to set or remove, I would check the motherboard manual.
I would never jump start a PSU that you intend to use on your main rig to do a test run a loop on a custom watercooling job. I would just an old PSU to do that, you don't exactly need 1500watts to run a watercooling loop, also too many things could happen, so it's always best to use an older PSU.
If all else fails, I would consider sending back the board.