Steam games black screen on launch

[Sotiris_Ael]

So for a while I had a launch parameter that removed the black screen issue for steam games. But for some reason steam decided to delete the parameter and now I can't find it. I tried searching everywhere but can't find it anymore. Please if you will suggest something, suggest an actual parameter and not "verify cache" or "reinstall" because that wont fix it. And also it is not
-windowed.

Also when I launch, I get a black screen, I can hear the sound just fine and then i get "Not in Optimum mode" from my display.

 

[Ge15t]

Basic question, but are all your drivers up to date? Are you using a laptop or a desktop? By any chance are you running a resolution not native to your screen? This issue is usually a resolution problem within the game, maybe the game is trying to force a res your screen cant display?

Try launching a game, press ALT+ENTER and it should appear in windowed mode, leaving you free to change the resolution to your native.

 

[Sotiris_Ael]

Drivers are up to date, desktop, and everything is fine, I said i even tried the windowed and changed the resolution in game but black screen still exists. I only need a launch parameter to fix it but i forgot which one it was.