Try a full reboot, try the old generic reset noted at http://www.cnet.com/forums/post/30c241c5-dd8b-4d73-b08d-c6e15897fe5f/
Still not working? Then get repair estimates or consider turning off the laptop WiFi and get wired for now. There are also 10 to 20 dollar USB WiFi sticks to try.
My Samsung laptop dropped off the table onto a waste basket. Result: no connection to internet even though wireless connection shows. Also, the key (F12) stays lit and cannot be turned off.
Tried shutting down and restarting. Did not work. Any ideas? Thanks....................