There’s no simple way to just turn on the wireless antenna?
I don't have Netgear equipment, so I can't say for sure, but it looked like you could look at pages 3-8, 3-9 and following to concentrate on the wireless connection. I didn't see a simple switch. The fact that your wireless used to work and then just quit argues that something happened in your configuration settings. You could also try a reset by pushing the reset button on the back with something small and pointed. As someone else pointed out, that might require you to establish a new password both on the router and then each of your computers. Sorry to make this complicated.