New PC Black Screen on first boot. 5080 issue?

First post. Hopefully I've added enough info. Let me know if not. Spec, photos below/attached

My PC arrived today. Unfortunately I can only get a black screen.

The only thing I can see that may be an indication of the issue is a red light on the motherboard. On boot the DRAM light is on, but goes away. Then the VGA light comes on and stays on.

I'm not familiar with pc building or set up. Hence picking a pre built. I'm fine with some basics but I'm pretty lost from here.

I followed the steps for set up on the welcome guide and in the emails I received specific to my set up. The hdmi cable is in the GPU etc.

All fans and lights are working for the GPU, CPU cooler case fans.

On first boot attempt I left it for probably a good 30+ minutes hoping it might be related to the initial set up. But no change at all to the screen at any point.

I have tired different hdmi cables, monitors, ports. All just black screen. The monitors do recognise the device though. As they don't go into power saver mode like they do if there is no input. They just sit on a black screen.

After reading other posts, I tried the motherboard hdmi and other ports. Also just black screen on both monitors.

Nothing seems to be loose or damaged in transit. But I'm really not familiar with building PCs so can't say for sure. I've checked all of the cable connectors I have access to and they all seem solid.