A minor setting change can sometimes cause the wallpaper to become corrupted and turn black. Disabling and re-enabling the "Show desktop background image" setting can resolve this issue.

If your Desktop ... black color for your background. Open Windows 11 Settings > Personalization. You will see the setting here. Select your favorite picture and make it your Desktop wallpaper.

The desktop background area will turn black when selected or highlighted. In this case, you must restore the desktop wallpaper to the original location or folder. If your graphics card driver is ...