I just got a new gaming computer and there is a male hdmi cable sticking out the back of it. It’s sticking out maybe a foot. The cable wasn’t long enough so I got a female to female adapter for it and plugged it in. No picture, no sound. All the hdmi ports on the back work fine, but I figured the one sticking out was for my graphics card so I wanted to use it if I could. Any clearificarion as to what the cable is for or why it didn’t work would be awesome! Thanks guys.