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Gut feeling is driver related. Did you go to Nvidia's website and download the latest driver for your card? Don't do it via Windows built in driver tool.
If that doesn't fix it, some motherboards have a build in HDMI port. In other words, if your computer has another port, try that. It would bypass your video card completely.
The only other thing I can think of is to disconnect power, open up the case and nudge your card gently into your motherboard to make sure it's seated correctly.
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