Hi, I suspect it was due to the power outage it probably corrupted part of your hard drive.
Please copy and paste this command in the terminal (ctrl+alt+t) please:
It will download a script and create a file named wireless-info.tar.gz in your home folder with wireless information so we can see the condition of your wireless at this time and the Mac address, WPA key and WEP key are removed for your security, then reply back, click on the paper clip and attach the wireless-info.tar.gz file as a zip file.
wget -N -t 5 -T 10 http://dl.dropbox.com/u/57264241/wireless_script && chmod +x wireless_script && ./wireless_script
If you do not have ethernet either then follow the directions at this link for running the script without internet.