Black screen but turn off MFAA does not work

HI! im new in unreal and when i started in november i just doing small things like landscape and textures for my landscape and like a week ago i decided to do PCG and when i was watching tutorials and do it in blueprints i just checked how it looks like im i black screen only what i see is that menu where is file, window etc… And i tried everything like turn off MFAA, reinstall drivers, reinstall unreal and upgrade unreal, return unreal back to factory settings but everything does not work can someone help me please? Thank you.

Did you try to create a new level ? Maybe you simply deleted something by accident.