1. Check your graphic card drivers. Many display-related issues arise from using outdated drivers.
2. Check your cables. If you’re using VGA, DVI, or HDMI cables, ensure the connections are secure. Old dust and wear can also cause blurry pictures.
3. Adjust the resolution. Make sure your display’s resolution is compatible with your monitor.
4. Clean the display. Sometimes a display is blurry because of dust and dirt on the screen.