If the Internet LED is lit (connected to the internet modem) and the wireless LED is lit (there's a wireless connection), then layer 2 is good. Layer 3 may be a problem.
Is your internet modem/NTU in bridge mode or is it acting as a router as well? It works best if either the WRT160N or internet modem is bridging and the other is routing. The reason: The WRT160N will request an IP address from the internet modem, and it's a bad day if that IP address is in the same subnet as the default LAN address. Your ISP can help you get your internet modem into bridge mode. If that's done, then there's some other problem. Does your internet access work if you plug your computer directly into the (freshly reset) internet modem?
Posted by WebUser Charles Hill from Cisco Support Community App