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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