Replacement Power button not pressing or clicking

Hi all,

My power button stopped clicking in - when you pressed against it the button never moved and didn't click.

I brought a new power button ribbon cable and replaced it.

When I put the button in and hold the bracket against it the button works and clicks, however as soon as I put 1 screw in the bracket the power button stops clicking and goes stiff again.

I have made sure the power button is in correctly, metal bracket down etc.

Ive tried 2 power ribbons now and they all click, just not when the bracket is screwed in.

What gives?

Thanks in advance