To play Rocket League, you must 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 Out-of-date drivers may fail when telling a piece of hardware (like a video card) how to run a specific type of software (like Rocket League). 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 fix graphic problems and frame rate drops in Rocket League? and this did not solve the issue try the next step in our troubleshooting: How do I set my primary display video card for Rocket League?