Off-switch

Does the internet work when you plug a cable into the router, too? If the modem works, something's up with the router. Is it set up properly? If so, it's a question of whether it's totally defunct or whether it's just the wireless, but in your situation, that may not much matter. I'd check all the router settings (you DO know them, right?) and then take appropriate action. You could also call the router company for tech support. They'll help you make a final determination on whether you need a new one or not.