There are more experienced people on here than me, but I would suggest trying to determine which item has the problem, router or laptop?
It seems strange that your laptop is not picking up ANY networks, as I would expect something to show from somewhere.
Can you take your laptop to a place where you are certain there are networks available? If nothing still shows, that would imply the problem is with your laptop rather than router. You can also try the reverse if you know someone else with a laptop, could they detect/connect to your network?