To play Fortnite, ensure that your computer has current video card drivers.
Drivers are the software that tell the hardware how to run. Out-of-date drivers may fail when telling a piece of hardware (like a video card) how to run a specific type of software (like Fortnite). making sure your video card drivers are up to date can solve many video problems.
The following links contain the most up-to-date drivers for each manufacturer:
If you are following the series of articles in How do I troubleshoot crashes, errors, and performance issues in Fortnite on PC? and this did not solve the issue try the next step in our troubleshooting: How do I run the Epic Games Launcher as an Administrator?
If you are following the series of articles in How do I troubleshoot low frame rate (FPS) in Fortnite? and this did not solve the issue try the next step in our troubleshooting: How do I disable background applications?