The drivers might not be installed correctly you might have to uninstall the graphics card restart your computer then reinstall the graphics card and its drivers If your computer came with a motherboard disc the drivers could be on it Click start control panel administrive tools computer management device manager scroll to display adapters + to expand you might see a yellow question mark ? or exclamation mark ! or a red x right click select reinstall drivers if you physically remove your video/graphics card restart your computer then reinstall it this should activate the found new hardware wizard make sure there is no dust built up or in the video card socket if you need more help with this post a reply
hope this helps you
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