Have you disabled your integrated graphic card? (if you have any)
The motherboards with integrated graphic sometimes need to be disabled manually. This is often done by pressing "delete" during boot screen to access the BIOS setup page. Search all the menues and you will hopefully find the correct parameter.
At my computer I changed the setting from "Use internal" --> "External PCI-E if exist"
You can try to download the drivers for the graphic card if you haven't
done it yet:
http://www.gigabyte.com.tw/Support/VGA/Driver_Model.aspx?ProductID=1247#anchor_os
There is always a chance that you have been unlucky and have gotten faulty product. Then the solution is to send the item back to the place where you bought it.
Testimonial: "Thanks !will try it!"
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