That shouldn’t be enough to stop the signal.
Have you tried switching the wireless type? I.E. from “G” to “N” or something like that? I know that my Macbook Air can see some networks, but not connect to them. I get the same thing, “Connection Failed.” That happens on my iPhone too.
I get that error whenever I switch my Airport to 802.11n. I have to use 802.11b\g compatible in order to have all the computers and phone in the house connect.
Sadly I do not know how, if even, you can change the signal type\strength on a Netgear. I personally would just start poking around in the router to see if it is possible. But if you are not familiar with doing things like that, then I would advise against it, as you can mess up your entire network really bad if you screw up!