can you describe further? When your turn the computer on, does the monitor display the picture? For how long? Have you set the resolution on your desktop to one compatible with your screen? Try using another monitor briefly on your PC, if not use your television, plug it in with a HDMI/ vga cable. Have a look through all your monitor settings in the monitor's option button, reset it or look for any problems. Have you set your desktop refresh rate at the compatible refresh rates for the monitor?