Question New Psu and Gpu, no output signal.

[Tazbiff]

Hi. I have an old PC that I have updated bit by bit. The specifications before the new gpu/psu:

Motherboard: Asus TUF gaming B560-plus Wifi

CPU: Intel Core I9-11900KF

Ram: Corsair Vengeance lpx DDR4 3000mhz 64Gb

GPU: Asus GeForce GTX 1070 ROG Strix Gaming

Psu: Corsair CX750M

Then I bought a gpu and psu:

Psu: Corsair RM1000X

Gpu: GeForce RTX 4070 Super 12G Ventus 2x OC

After I switched to these components and all the cabling, I started the PC as usual. Apart from that there is no image signal from the gpu. Then i tryed to switch back to the old Gpu, to check if I had a bad graphics card. Still no image signal either on hdmi or dp. Then switched back to old psu and gpu, still same problem. No image signal from gpu.

Tried afterwards to remove the gpu to test the image signal directly from the mainboard, and once again zero image signal.

Now i have the Motherboard on a cardbord with only the psu, one ram connected, still no output signal on the Hdmi from the motherboard.

Has anyone been lost in this before? Have checked around a bit but no one with this motherboard. See those with newer motherboards get a bios flashback/update. But can't find a solution for this outside of Windows.

Would be very happy for help with this