In case this happens again:
The WLAN light didn't light up as in the WLAN was turned off. If the LAN connection is up and running though you can pretty much rule out a power issue of any kind.
Some routers have a small switch near the jacks to quickly turn the WLAN on and off.
If there's no switch or it isn't turned off, a power cycle might fix it.
If the WLAN has got turned off for good, all you have to do is navigate to the router's menu and turn it back on. There's absolutely no need to change the network ID or password or setup new networks.
To get to the router menu: Start -> Run, type "cmd", enter, in the black window (command prompt) type "ipconfig", enter.
Your PC's LAN connection details will appear, among them the gateway address, something like 192.168.1.1. Just type that in the browser's address bar and you're in the router's menu (you might have to login first).
In there, find the Wireless settings and turn WLAN back on.
The AOL guy was working off a script and my guess is that 90% of that call was a complete waste of time.