Mac Pro not giving apple loading screen
I just got a Mac Pro and I’ve been using Windows on it but I wanted to do video editing so I decided to use macOS but when I tried to boot into recovery it didn’t give a mac choosing screen and it wouldn’t let me boot from CD or USB, I couldn’t even get it to boot to startup manager. Can anyone help?
System specs:
dual Cpu Intel Xeon, 10 gigs ddr3 ram, 1 tb hard drive, and a different graphics card (Pegatron graphics card I think,I have a feeling that is the problem because the one that came with it died eventually)