ea app not opening the sims 4

@CarkyLuis  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, please run a dxdiag and attach it to a post.

https://help.ea.com/en-us/help/pc/how-to-gather-dxdiag-information/

Ive been having the same issue. The error message displays something about "background services" as the error message. I've cleaned up my computer, redownloaded the app, moved folders around, still no luck.

@maliyah7  Please post a screenshot of the error message.

This has been happening to me for the last several days as well.  I try to launch it, and it just... doesn't launch; after a few moments, it simply returns me to the EA app homepage (even if I try launching it from the bin in the C: Drive (pathway This PC > Local Disk C: > Program Files > EA Games > The Sims 4 > Game > Bin).  No error messages; it just takes me back to the app homepage.  I've tried repairing the app and the game, uninstalling and reinstalling the EA App (including doing so through Revo), running the app as an admin, uninstalling and reinstalling the game itself, and restarting my computer, all to no avail.  I also tried these steps (and am including the resulting message): 

If this is happening after you uninstalled the App with Revo, please run a couple of basic checks of your Windows system files:

• Hit Windows key-X
• Choose either “PowerShell (Administrator)” or “Windows Terminal (Administrator),” whichever option is offered
• Inside the window that appears, copy and paste “DISM.exe /Online /Cleanup-image /Restorehealth” without quotes, and enter
• The system will start validating soon. If it throws an error, please list it here
• After it reaches 100%, hit Windows key-X again
• Again, choose “PowerShell (Administrator)” or “Windows Terminal (Administrator)”
• Inside the window, copy and paste “sfc /scannow” without quotes, and enter

However, I have, at different times, noticed a couple of things that may or may not be relevant:  1) While attempting to launch the game, even though it doesn't appear in the Processes tab of the Task Manager, it does appear in the Details tab with the UAC virtualization disabled (I did not disable it; it is automatically disabled).  2) When attempting to move my Mods folder or even the Sims 4 folder itself to a different location, I get an error message stating that it can't be moved because a file is open elsewhere/there's a sync error with OneDrive (even though the status column for these folders shows an active status and I have no idea where else the files might be open).  Any ideas on what else to do?

@Ardruna  Try pausing OneDrive syncing and then moving the Mods folder again.  The option shows up when you right-click the cloud icon in the lower-right corner of the screen.

If moving only the Mods folder doesn't help, move the entire Sims 4 folder it's in.  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/

So, unfortunately, pausing the OneDrive syncing didn't make any difference.  So, attaching an image of the sync error and also the dxdiag.

@Ardruna  Did you try restarting your computer after pausing syncing?  This error shouldn't ever happen when syncing is paused, but perhaps the system didn't get the memo, so to speak.  A restart would address that.

If not, I'd suggest getting rid of OneDrive entirely, at least for now.  There are ways to make it work for you, in whatever capacity you prefer, but the first step here is to get Sims 4 running again.  Here's how to deal with OneDrive:

https://answers.ea.com/t5/PC/CURRENT-ISSUE-Sims-4-saves-user-content-disappearing-PC/m-p/12475370#Remove

Please do run the Command Prompt command when you're done to confirm that the Documents directory is no longer inside OneDrive.

So, good news and bad news.  I was able to uninstall OneDrive and move all the files elsewhere.  I was able to successfully launch the game, but, of course, it was like a clean install; it had no saves, no mods, nothing.  When I tried to put back the main files (saves, mods, screenshots) so I could resume my games, it again stopped launching successfully.  I tried again removing the mods folder, and relaunching, but that didn't help--it is once again simply returning me to the app homepage.  Now what?

@Ardruna  Remove or rename the new Sims 4 folder, then try to launch the game again and see whether it works.  If not, please run the Command Prompt command again to confirm that your computer's Documents directory is still in the correct location:

C:\Users\your username\Documents

If Documents is still where it belongs and you can't play even after removing the newer Sims 4 folder, please post a new dxdiag.  Please also let me know what antivirus you use.

So, happy news, I was able to get it to work!  I was able to isolate the specific file that seemed to be tripping things up (a piece of CC accessories, oddly enough), and now it seems to be running normally again.