Prime Z790 failing to show display

Hello,

I am having an issue getting any display on start up with this custom build.

I7-13700KF, 32GB RAM, NVIDIA GEFORCE RTX 4070TI, ASUS PRIME Z790

I've plugged in the device via HDMi to my Dell G3223D but I am failing to get any display from the motherboard or GPU.

It seems to go through POST but then a bright white constant light appears to the right of CPU/DRAM/VGA/BOOT