I think I have the same problem. I'm on a machine running windows 10. My game is fully updated (April 19th, 2019) I took out all my cc, and eventually wiped the entire Sims 4 folder. I repaired the game so many times, and I've just uninstalled and reinstalled.
When I try to run the sims 4, it shows the EA and the Maxis screens, and then it just freezes at the "The Sims 4" screen while the music plays. If I click anywhere, the screen gets covered in a white fog and the windowed bar at the top says (Not Responding). Nothing happens until I force-shut-down.
I read something about expansion packs, like downloading a new one could fix it? Anyway, I have GTW, Toddler stuff, Parenthood, Cats and Dogs, and Seasons.
I'm thinking it could be my graphics card. If anyone needs that information, I can find it, I just don't know it off the top of my head.