Ever wonder why Windows displays the Welcome Screen? It is a way to hide what’s going on in the background. The Desktop Window Manager or DWM loads the user interface or renders the GUI of Windows.

Use the following solutions to fix the Black and White squares issue on your Windows 11/10 computer screen. Preliminary fixes Roll back or update your graphics card driver Did you overclock your GPU?

Explore simple fixes and expert tips to eliminate those frustrating vertical lines for a seamless screen experience. Try turning your monitor off and then on again to fix vertical lines on the screen.