If you are sure that the driver you installed is the correct one ...check the card not to be disconnected from the ribbon or so...If the computer sees the video card in device manager ..but it is in yellow with a ask sign ..it means that the driver you use is not the one you need...
to get the correct driver ..go to the support site ..and download it from there after you selected the model ..number and the operation system you use.. If after you format it ..you changed the operation system ...you will need new drives..If the card is not detected at all..in the device manager ..than it must be corrupted and you will have to change it ..
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