Stuck at initial loading screen

Hi, I purchased Halo 5 Guardians and have yet to play it. I see the initial loading screen and that’s it. I’m stuck there. I’ve uninstalled and re-installed. That didn’t help. What’s causing this?

By initial loading screen, do you mean the game launch screen (with chief and locke), the black screen with loading symbol after the developer studio animations, or the press to start screen?