Re: S4 -White screen on start; game fails to load
@EsuMiwa7 There are a few different reasons why a new user account might help. One is that a new account means new user files; this should have been addressed by the new Sims 4 user folder, but it may not have been if you put back some of your existing content. Or if OneDrive is syncing the contents of Documents with cloud storage, it could have redownloaded your old content even after removing it.
Having OneDrive set to auto-sync could also cause problems all by itself, so if you have it enabled in the old user account but not the new one, that's a good place to start.
Finally, the permissions on your Documents directory, or any folder within it, could be borked; again, a new user account means new user folders, and by extension newly applied default permissions on those folders. If you're comfortable with the takeown /F command, you could try it, or you could go looking for anomalies either in the folders' permissions or in your antivirus settings.