Troubleshooting video and display issues requires a systematic approach to identify and resolve problems effectively. Start by checking physical connections, ensuring that cables between the computer and the display are securely connected. Inspect for any visible damage to cables or connectors. If using external devices like graphics cards, ensure they are seated correctly in their respective slots. Confirm that the display is powered on and functioning. Adjust display settings, including resolution and refresh rate, to ensure compatibility with the monitor. Update graphics drivers to the latest version, as outdated or incompatible drivers can cause display problems. Test the display on another system or try a different display on the problematic system to isolate the source of the issue. Look for error messages in device manager or system logs related to the graphics hardware. If the issue persists, consider performing a system restore to revert to a previous configuration when the display was functioning correctly. A methodical and patient approach, combined with a good understanding of display technology and graphics hardware, is essential for successful troubleshooting.