zemsantos- Everyone with experience on this has posted that connecting the Airport board the wrong way will likely damage your logic board such that wifi will no longer work. Your symptoms seem to match this.
You have 2 options- buy another Airport board just in case the logic board is actually okay, or buy a little USB wifi adapter and use that instead. There are USB wifi adapters that sit almost completely flush against the side of the notebook, so that's not a bad option at all. The trick is to make sure you buy a compatible adapter. Here are some links I had gathered on this, my Airport board replacement ended up working so I didn't try an adapter, but the info might help you-
https://discussions.apple.com/thread/4076589?start=0&tstart=0
https://discussions.apple.com/thread/2709970?start=0&tstart=0
http://www.insanelymac.com/forum/index.php?showtopic=227628
Airlink driver for Realtek RTL8188SU:
http://www.airlink101.com/support/index.php?cmd=files&id=178
http://airlink101.com/download/download_links/m-awll5088_mac.pdf