To fix a computer screen shadow problem, first check your monitor cable connections and replace damaged cables. Update your graphics drivers to ensure compatibility. Adjust your display settings, like resolution and refresh rate, to recommended values. Test the monitor on another computer to rule out hardware issues. If shadows persist, your monitor’s internal components may be failing, and professional repair or replacement could be needed. Also, ensure no nearby electronic devices are causing interference. Simple steps like these often resolve shadow or ghosting issues effectively.