So here’s the issue. My computer can only run Fortnite on the lower settings otherwise it crashes and shuts down. One of my mates came over and turned the graphics all the way up and it crashed my computer. But now every time i open the game again my whole computer shuts down because the graphics are maxed and i don’t get a chance to rectify it.
Try looking for .ini files with settings in the game folder and look for quality lines. Set their values to 0.
I sort of did the same thing but i turned on the DirectX 12 shaders and reset my game and i guesds my graphics driver doesnt have the capasity to run it and i can launch the game to change it so im stuck and have no idea, I couldnt find the .ini flie
Try checking if you have a Saved/Config/Windows folder inside your game folder
there should be a file called GameUserSettings.ini
inside you should have a ScalabilityGroups segment. Try setting all options to lower that are not at 0
so from this
[ScalabilityGroups]
sg.ResolutionQuality=0
sg.ViewDistanceQuality=3
sg.AntiAliasingQuality=3
sg.ShadowQuality=3
sg.GlobalIlluminationQuality=3
sg.ReflectionQuality=3
sg.PostProcessQuality=3
sg.TextureQuality=3
sg.EffectsQuality=3
sg.FoliageQuality=3
sg.ShadingQuality=3
to
[ScalabilityGroups]
sg.ResolutionQuality=0
sg.ViewDistanceQuality=1
sg.AntiAliasingQuality=1
sg.ShadowQuality=1
sg.GlobalIlluminationQuality=1
sg.ReflectionQuality=1
sg.PostProcessQuality=1
sg.TextureQuality=1
sg.EffectsQuality=1
sg.FoliageQuality=1
sg.ShadingQuality=1
Save and try to run the game
You can try going all the way to 0 but I’m not sure all options have that range.
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go to %localappdata%\FortniteGame\Saved\Config\WindowsClient and there see there the GameUserSettings and delete it. then at epic games launcher click on the 3 dots and click on manage and there verify. then it should take a few minutes and you should be fixed. hope it helps 
it worked for me
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