Feed to my screen

My computer emachines T6412 turns on but no feed to my screen, I know the Monitor is good I have tried it on another pc and works great, the screen shows check HDMI connection. I am not sure if it is the video card or not. When I open up the pc it was very dirty, I am not sure that might have cause the problem and shorted out. Is there any thing I can check to see if it is good or not?
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