My screen is black and can't find a way to fix it.

I think I changed the resolution and all of a sudden the screen turned black. I verified the integrity of game cache, the screen is still black. I delete the whole game and reinstalled it, the screen is still black. Can someone help me fix this, thank you so much.

 

Thank you for making the effort to help me. I just did it, the screen is still displayed black.
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What file type is it?
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Thank you so much man, much appreciated.