Low wifi signal after taking mobo out and putting it back in

Hello, I was going to install a new motherboard onto my computer today, but I decided to do it all in one go after the new psu and graphics card arrived. I already removed the old motherboard and psu at that point though, so I placed them back. After turning the computer on everything went fine, but the wifi signal became very low. Usually the signal is a steady 5 bars and after reinstalling the old mobo it became 1 bar. I'm absolutely certain the problem is with the computer and not with the router or any interference. The motherboard has an integrated wifi. What can I do to fix this? Is there a loose plug somewhere? And can you tell me what the integrated wifi looks like? This is my motherboard: http://h20000.www2.hp.com/bizsupport/TechSupport/Docume...