When encountering display or video-related issues on a computer or device, it can be frustrating and impact your overall user experience. However, by following a systematic approach, you can diagnose and resolve these problems effectively. Here's a step-by-step guide on how to diagnose and resolve display or video-related issues:

1. Check physical connections: Ensure that all cables connecting your computer or device to the display are securely plugged in. Verify that the power cables, HDMI or DisplayPort cables, and any other connectors are properly connected and undamaged. Try unplugging and reseating the cables to ensure a secure connection.

2. Adjust display settings: Verify that the display settings on your computer or device are properly configured. Check the screen resolution, refresh rate, and color depth settings to ensure they match the capabilities of your display. Incorrect settings can result in distorted or blurry images.

3. Update graphics drivers: Outdated or faulty graphics drivers can cause display or video-related issues. Go to the official website of the manufacturer of your graphics card, such as NVIDIA, AMD, or Intel, and access the latest drivers available for your particular graphics card model. Proceed to install the updated drivers and restart your computer afterwards.

4. Adjust display settings on the display itself: Some displays have built-in settings that can affect the image quality or display output. Use the buttons or menus on the display itself to adjust settings such as brightness, contrast, and color temperature. Refer to the display's user manual for specific instructions.

5. Test with a different display or cable: To determine if the issue lies with your computer or device or with the display itself, try connecting your computer or device to a different display using a different cable. If the problem persists with the new display and cable, it indicates a potential issue with your computer or device.

6. Run display-related troubleshooters: Many operating systems have built-in troubleshooters that can automatically diagnose and fix display-related issues. Access the troubleshooting options in your computer or device's settings and run the display or video-related troubleshooters available. Follow any recommended steps or actions provided by the troubleshooter.

7. Check for overheating: Overheating can affect the performance and stability of your computer's graphics card. Ensure that the cooling system in your computer or device is functioning properly. Clean any dust or debris from the fans and vents, and ensure proper airflow around the computer or device.

8. Scan for malware: Malware infections can sometimes cause display or video-related issues. Run a full system scan using reputable antivirus software to detect and remove any malware that may be affecting your computer or device's performance.

9. Perform a system restore or reset: If the issue started occurring after a recent software installation or system update, consider performing a system restore to a point before the problem began. This can help revert your computer or device to a previous state where the display or video-related issues were not present. Alternatively, you can perform a system reset to restore the operating system to its default settings.

10. Seek professional assistance: If you have followed all the above steps and the display or video-related issues persist, it may be necessary to seek professional assistance. Contact the manufacturer's support team or consult a technician who specializes in computer hardware for further diagnosis and resolution.

Remember to exercise caution when making any changes to your computer or device's settings, and always have a backup of your important data before performing any troubleshooting steps. Display or video-related issues can vary depending on the specific computer or device and its components, so adapt these steps as necessary.