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I only have limited experience with this, but I can think of a few things that could help.
First, unplug your computer from power/monitor, open it up, disconnect the card from power, pull it out, and put it back, making sure to gently push it until it's entirely secure. Put everything back together, ensuring that it's all 100% secure and try again.
Second, as LE said, uninstall and reinstall your drivers.
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