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• Try to turn on the PC. • This message appears when the signal from the PC (video card) is out of horizontal or vertical frequency range of the display. See the 'Specifications' section of this manual and configure your display again. • This message appears when the signal cable between your PC and your display is not connected. Check the signal cable and try again. Do you see a "OSD LOCKED" message on the screen? . Do you see “OSD LOCKED” when you push MENU button? • You can secure the current