Some video or graphics card manufacturers ship their products with a utility that prevents other video cards from being set as the primary card. Please be sure to check the toolbar in the lower right-hand corner of the desktop. If the program of another video card is already running. disable it's utility before setting it to Primary mode of the USB Display Adapter. Typically, the utility icon will be shown together with USB Display Adapter’s icon in the lower right-hand corner of the toolbar.
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