How to connect my LG 20LA6R TV to my Computer?

My TV in the back said SERVICE and in manual said PC Input. So i'm guessing that SERVICE = PC input. But the problem is what do i do next After it is connected? I try pressing TV/Video but there is no channel for it. Can someone please tell me what to do. Or help me out. I also read something about my TV something like. VGA(software Upgrade interface). So please i need to know how to do it thanks.

Answer:
Try posting your question in the computer forum. You'll get a better response.

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