gigabyte geforce 3070 ti

I built a new pc today, the only parts that remained the same from my old computer are my GPU, SSD, and Hard Drive. For some reason whenever my gpu is plugged in the computer cant move past the VGA stage of post. The computer can however boot from the IGpu if the gpu isn't plugged in. Here are...

I've just assembled a new rig with all new components and am getting a black screen on boot. The MB shows the VGA + Boot LEDs for a short while and then they go out, but nothing ever shows on my monitor with either the MB output or the GPU output. Here's the full specs of my build: ASRock B660...