My setup :
GPU : MSI RX 590 armor 8gb OC
CPU : AMD Ryzen 5 3400G
Mobo : MSI B450m Mortar Max / used to be ASRock B450m-HDV
RAM : 2x8gb Corsair Vengeance LPX DDR4-3200
PSU : Corsair VS650 80 Plus 650watts
Storage : 512gb Intel 660p m.2 PCIe 3.0
Monitor : AOC g2250VWQ6 21.5"
Long story short the GPU is not detected by the BIOS or the Device Manager , when I go into the BIOS with MSI Board Explore the PCIe x16 slot appears empty despite having the GPU installed.
The setup is 1 month old , until 3 days ago I used it with the integrated graphics Vega 11 and the ASRock B450m-HDV mobo and it ran perfect.
I installed the GPU and I noticed I did not have any signal, proceeded to use DDU to get rid of the drivers and reinstall them again , that did not work , I switched in BIOS to use the PEG card not the integrated one , it does not work, eventually I went to a repair shop for a quick diagnosis , my GPU works fine on another test computer , but any GPU that was put into mine did not work thus the diagnosis was : faulty PCIe slot.
After that I got the MSI b450m Mortar Max becouse I wanted to upgrade sooner or later to it anyway and was going to send the other mobo in for warranty service.
Now , I just got the Mortar Max a few hours ago , rebuilt the PC , and still while setting up windows there is no signal from the GPU only the iGPU.
I started doing the whole drivers thing again , clean install of the OS , I swapped out the M2 for a normal SSD to see if it works (the 2nd M2 does not work if the 2nd PCIe slot on the mobo is used , despite not using those figured to give it a try) still nothing.
Everything sits flush the power cables are connected the fans on the GPU are spinning , as I mentioned above in the test PC at the repair shop the RX 590 worked.
The problem is that I cannot make it so the PCIe slot and the card in it to be seen by the system , on 2 motherboards already.
Is there something I missed? This wouldn't be the first time i'm stupid 
Thanks in advance
