Samsung 400BX User Manual - Page 148
Check the followings.
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7 Troubleshooting Guide 7.1.3 Check the followings. Installation issue (PC mode) The screen keeps switching on and off. Blank spaces are found at the top and bottom of the screen when an HDMI or HDMI-DVI cable is connected to the monitor and PC. Check the cable connection between the product and PC, and ensure the connection is secure. ("2.2Connecting and Using a PC") Blank spaces on the screen are not caused by the monitor. The cause of the problem is the PC or graphics card, and can be fixed by adjusting the screen size in the HDMI or DVI option of the graphics card settings menu. If the graphics card settings menu has no option to adjust the screen size, update the graphics card driver to the latest version. (Please contact the grap hics card or computer manufacturer for details on how to adjust the screen settings.) Screen issue The power LED is off. The screen will not switch on. Make sure that the power cord is connected. ("2.2Connecting and Using a PC") "No Signal" is displayed on the screen (refer to "Connecting to a PC"). Check that the product is connected correctly with a cable ("2.2Connecting and Using a PC") Check that the device connected to the product is powered on. "Not Optimum Mode" is displayed. This message is displayed when a signal from the graphics card exceeds the product's maximum resolution and frequency. Refer to the Standard Signal Mode Table and set the maximum resolution and frequency according to the product specifications. The images on the screen look distorted. Check the cable connection to the product ("2.2Connecting and Using a PC") 148 7 Troubleshooting Guide