*I* would also be tempted to connect the laptop (which is presumably potable, by definition) to the newtork by cable - just to see if it will connect when hard wired.
That would ease my mind into firmly believing it's a wi-fi problem rather than a settings problem.
It could be just about anything - so I'm always game to discount as many possibilities as possible, eventually the list gets shorter until it narrows down to the *actual* problem.