268Troubleshooting Guide1313 Troubleshooting Guide13.1.3 Check the followings.Installation issue (PC mode)The screen keeps switching on and off. Check the cable connection between theproduct and PC, and ensure the connection issecure.Blank spaces are found at the top and bottomof the screen when an HDMI or HDMI-DVIcable is connected to the product and PC.Blank spaces on the screen are not caused bythe product.The cause of the problem is the PC or graphicscard, and can be fixed by adjusting the screensize in the HDMI or DVI option of the graphicscard settings menu.If the graphics card settings menu has nooption to adjust the screen size, update thegraphics card driver to the latest version.(Please contact the graphics card or computermanufacturer for details on how to adjust thescreen settings.)PC is shown in Source when a PC is notconnected.PC is always shown in Source irrespective ofwhether or not a PC is connected.Screen issueThe power LED is off. The screen will notswitch on.Make sure that the power cord is connected.("2.2 Connecting and Using a PC")"No Signal" is displayed on the screen (referto "Connecting to a PC").Check that the product is connected correctlywith a cable.("2.2 Connecting and Using a PC")Check that the device connected to theproduct is powered on."Not Optimum Mode" is displayed. This message is displayed when a signal fromthe graphics card exceeds the product'smaximum resolution and frequency.Refer to the Standard Signal Mode Table andset the maximum resolution and frequencyaccording to the product specifications.The images on the screen look distorted. Check the cable connection to the product.("2.2 Connecting and Using a PC")
