Re: Sims 4 not launching properly in EA/Steam
@Le_Neef_ As a test, please try playing in a clean user folder. Move the entire Sims 4 folder out of Documents > Electronic Arts and onto your desktop, and when you launch the game, if it launches, a clean folder will spawn with no content. (Your saves and other content will be intact in the folder you moved but temporarily not read by the game.) Don't add anything to the new folder yet; just let me know whether you can get far enough to start a new save and play in live mode for a bit.
If that doesn't help, try launching the game in windowed mode. Go into Documents > Electronic Arts > The Sims 4, open options.ini, search for fullscreen , and set it to 0 (zero). If this works, you can go back to fullscreen mode, but at the same time, set the in-game resolution to whatever your monitor uses.
If that doesn't help either, please run a dxdiag and attach it to a post.
https://help.ea.com/en-us/help/pc/how-to-gather-dxdiag-information/