No display on monitor since installing 7850

Slobrob

Honorable
Aug 9, 2012
4
0
10,510
Hi, I've just installed my new gfx card and for some reason my monitor is not recognising the signal. I have also noticed that the keyboard lights are not showing either.

Tried putting my previous card back in and I'm having the same issues and no idea what could be causing the problem?
It's powering up but that's it and I'm stuck as to what the problem might be