Question The bolt won't come out

[Davidsin98]

Hello, I just got a pc and there was no post so I started searching what was the problem and I realized it was probably the screw, that screw is not like any other screws it's also probably springed, so I tried unscrewing it and it won't come out, it will make a click sound at some point and will stay on its place, here is the picture

 

[Davidsin98]

Update I just tried connecting monitor and still no output with all power cables connected, is it really a problem with that screw? Or the mobo is dead? The light is on when I connect it to the power