NOTE: Before performing any significant repairs, back up your computer's hard drive.
First, try a system restart
Start > Power > Restart
If That doesn't work I suggest you update the Display adapter driver from the Device Manager and check if it works.
Follow the below steps:
- Right-click the Start button and click on Device Manager.
- Select the Graphics driver from the list by extending Display adapters.
- Right-click on the Graphic driver and click on Update Driver Software.