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If this started after you changed the video card I would suggest putting the old card back in and seeing if the problem resolves itself. If it does then you either installed the wrong drivers for the new card or the new card may be defective
If this started after you changed the video card I would suggest putting the old card back in and seeing if the problem resolves itself. If it does then you either installed the wrong drivers for the new card or the new card may be defective