Question Pc wont give signal to monitor

Sep 3, 2019
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Specs are
Motherboard: Asus Crosshair Hero 8
Gpu: Asus Rog Strix 2080 Oc
Cpu: Ryzen 9 3900x
Ram: 4x8 Corsair vengeance pro rgb 3600
Psu: rm850x
Aquaero fan controller
Cpu and gpu waterblock are both from Corsair

So basically, I just finished building my first watercooling build (didn’t breadboard like a amateur) basically the monitor goes through it’s boot process. After the vga light comes on it goes to the green boot and the goes from 99 to 98 and the screen lights up like it wants to come on then immediately the motherboard displays b4 and the monitor says “no input”. After that it cycles to 9c for a second then to A0 for a split second and then gets stuck on 02 until I reboot it. I have tried the one stick of ram in A2 slot. I am currently doing the cmos battery reset but doubt it’ll do anything as the motherboard is brand new. I traded in one gpu for this brand new one and it’s still doing it. I had a rm750x psu but upgraded to the 850 hoping it was a power issue but it wasn’t. I’m running out of ideas and REALLY do not wanna take the whole loop apart if it can be avoided. I will though if I go through everyone’s troubleshooting.