Stuck on Red and Orange lights.

I have just upgraded my mb, ram, cpu and cooler. Now my pc has these parts https://uk.pcpartpicker.com/list/L4nm74

The first time I switched it on the ram lit up but nothing happened on the screen. I then rebooted and the ram no longer lit up.

All I have is a spinning cpu fan and red and orange lights.

I then took gpu out and used onboard graphics

I then used just one stick of ram. Tried every slot. Tried the other stick. Tried flashing the bios. Tried leaving it to sit overnight. Tried unplugging all but one ssd.

The joys of building a pc!

What should I try next?

Is Grok or other ai useful for troubleshooting?