So I connect to PSU:
MOBO 24 pin
SSD
GPU via PCIe

I connecto to MOBO:
CPU G5420 with fan
PCIe 16x on slot 2
SSD
RAM

And also the jumper on position 1 & 2.


I turn on the PSU and inmediately, CPU fan and GPU fans start to roll.


Now the problem comes with my next action:
I connect CPU power 12V and/or
I connect the 4x pin recommended for more than 3 GPUs


Nothing happens. I hear no sound, no light on the MOBO (I have it from 2018 and not sure if it did light some led, I don't see any). Nothing at all. I press power button and doesn't respond at all. Nothing.


This is an old MOBO, I mined with it on 2018 and it was working correctly. It hasn't been touched since then. CPU is new.



What is it?? I really have no idea