I use reference RX480 model of xfx.
There is a problem of power.
Whem I turn-on and turn off the PC 1st try, there is no response when I push the power button from 2nd try.
I must cut-off the external power by switch on PSU.
After cut-off the external power and push the power button, the PC turns-on.
I want to know how to resolve this problem.
It is NOT the problem of other system parts.
I tested every parts with another xfx amd graphic card.