Not my expertise, and perhaps you have already tried this, but if not, close down all the computers, and turn off the router and unplug it from the electrical socket. Wait about 30 seconds, then turn the router back on, then one of the computers.
You may have to visit the router's set up page again to reset the settings.
If that doesn't work, can you plug the cable connection in directly to one of the computers? That would let you know that the broadband is still available and working.
I've been using the MI424WR router that was supplied with my Verizon Fios package for the last year and a half without any issues. Now for some reason any direct broadband connection just doesn't work. I changed the cables, checked my network adapters, reset the default settings...nothing works. The wireless still works though and I have access to the settings that way. I've been trying to contact Verizon for a few days, but their customer service isn't helpful... at all. At this point I'm thinking that the router might be dead, or at least part of it is. Running Vista (32 bit) I'm getting the same network name, just not receiving any packets. Of the three computer connected via the router, (two XP and one Vista) not a single one still has a working broadband connection. Anyone else have a similar problem? Any tips would be greatly appreciated.