Wifi doesn't work with punctuation in password
Earlier at work I was able to get on a wifi network with no problem. After bringing it home, though, I couldn't do anything to get it to work. I restarted it, flushed the caches ( knew this shouldn't make a difference but tried anyway), tried several different security protocols on my local wifi network (WEP, WPA2, WPA/WPA2 Personal, WPA2 Enterprise) and nothing would work. Finally I thought of simplifying my password and sure enough that worked.
If you can't get connected try an alphanumeric-only password and you'll probably be fine.