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Hi Is there anyone who knows about high definition video card?

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I bought a high definition Dell LCD monitor two years back. But its high definition video is not working properly. The picture quality is getting dull. I called to my brother in law who is a technician, he told me that I should change my high definition video card. I did not know about high definition video card. Is there anyone who knows about high definition video card? Please tell me how to change it.

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