I have a problem with my computer I never figured out what it is. A few days ago, there was a fan noise from the case, so I hit the case with my finger and the display disappeared. I couldn't get the image back no matter what I did. I inserted my old video card and the image came up.

So far, I thought the problem was with the video card, but when I plug in my video card again and connect the case to the TV, the image comes to the TV, but the monitor does not. It says "cable not connected" on the screen. In short, when I plug in another video card, the image comes to the monitor, when I insert my main video card, there is no image on the monitor but it comes to the TV. Any help is appreciated...