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Make sure you are using new and latest display drivers. You can also try this one method that is- Turn the computer off. Power on the computer. When you see the Dell logo appear on the screen, press the F8 key until you see the Windows Advanced Boot Menu.Using the Up or Down arrow keys, highlight Enable VGA Mode.Check if the video is seen in this mode of Microsoft Windows. Get more further details and multiple solutions in Dell Latitude E5540 Manual.Good Luck.