Can't connect through router

I've had the same setup for two years, and everything was functioning fine until two days ago, but now I can't establish a wi-fi connection to a laptop or a connection to a desktop through a WRT54G router. I can connect to the network on the laptop, but a red X appears between the router and the internet icons in Network Sharing. When I open a browser on the desktop I receive "Server not found". A direct ethernet cable connection from the modem to both computers works fine.
I have power cycled all devices, I have reset the modem and the router, and I have tried different cables. I have also tried a second WRT54G router, but the same thing happens. Any suggestions would be greatly appreciated.

Thanks for the reply. I initial powered everything down, disconnecting all cables and cords on both routers and the modem. When that didn't work, I went into the modem's configuration page and hit the "Factory Reset" button. I also pressed the reset button on the back of both routers and went in and set it up again with the SSID I used before.
A wired connection from the modem to the router and from the router to my desktop returns a "Server Not Found" message when I open a browser. I think the fact that both a  wired connection from the modem to my laptop and from the modem to my desktop works indicate a router issue, but I can't be certain. You mentioned a configuration problem or a wifi issue, can you recommend a setting or place on the router's configuration page where I might be overlooking something? Thanks for the help.

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