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How to get HDMI working again after upgrading laptop graphics card?

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Sup everybody

 

A few months back, I bought an Alienware GTX 780m to replace my ASUS GTX 460m that was in my ASUS G53JW laptop. I had zero knowledge or experience, but thanks to all the guides you wrote, the card immediately worked after flashing an ASUS GTX 780m vbios onto it. The fans were controlled, and my graphics performed many times better than it did before. The only issue was that HDMI stopped working.

 

At the time, I didn't need HDMI, but now I do. Can you help me out?

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