You think, wow today i want to play Mafia 2 and you decide to install the game and then you starting it and you hear only sounds and see a Blackscreen.
With my knowledge can i show you, how to fix this problem.
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I found this way on google but not the direction how to find this and this costs hours of your life or a new Screen but you dont need to buy them.
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First.
Mafia 2 is in your "steamapps/common" folder and we must find the videoconfig to change the screen solution. But you have two Mafia 2 Folders. But the second folder where we cant find them is not visible for us and we cant search and find the Configf file too. When we want to find them, we must to navigate in this direction:

"C:\Users"
Then find your Computer Name and go in this folder.
After you find your computer name go this direction:
C:\Users\Your_Name\AppData\Local

And see now what i found.
Do you see what i see?[i.imagebanana.com]

Now go to 2k Games/Mafia II/saves and you will find the videoconfig.

Open the config and change the solution.
BUT Edit only THIS PART[i.imagebanana.com]

And now its done. Enjoy the game! Thanks for watching and please thumbs up and favourite this Guide.