Computer doesn't boot, RGB RAM lights up

[Tiltedque]

I just replaced my PSU today as this morning I found my computer crashing when I launched any game. I swapped GPU from computer A (the computer that keeps shutting down) with computer B (Works fine and has no issues). The GPU worked perfectly! I then proceeded to run games on computer A without a GPU and it powered through with some lag which is to be expected. 

I went from a 750w modular Supernova power supply 80+ Bronze to 850w modular EVGA Q4 80+ Gold.

Everything is plugged in but when I press the power button nothing happens for a few seconds and then the ram lights up but that is all. 
My build:
Nvidia RTX 2070
I7-8700K 
G.Skill Trident 3200Mhz 2x 8gb
Gigabyte z390 UD motherboard

[Guest]

Did you use the same cables from the old PSU on the new one?

 

[aradioactivesquirrel]

I am the only one that can help you because i am the only true squirrel.

 

Can you rest CMOS? it has 2 pins

Use this jumper to clear the BIOS configuration and reset the CMOS values to factory defaults. To clear
the CMOS values, use a metal object like a screwdriver to touch the two pins for a few seconds.