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no, the PSU is not the problem because it is connect to two 12v rails (2x30A)
You might aswell have wrong atached coolers to the board, i did have the same problem at the begining
no, that is also not a problem - if you connect it wrong, the fan is not moving
I tried to disable the chips one by one and only just one configuration is working - the 12 (0+1 disable). All other possibilities = ZOMBIE
I think that the board is bad... but maybe is between chair and keyboard ;-) I have other 3 boards that is not connect so tomorrow I will try it.
Woo, i am not really sure that connect 2 different rail to one system is good idea. I am definitely not going to do that.
Could you try again using 1 rail only?
If you are going to try another untouch board, please use 1 rail only

What are you afraid off? you can couple those rails np.