I had the same issue after receiving a new router. Here's the solution I found in another thread, posted by user SteveMoz. Worked great for me.
Firstly, you must perform a hard reset on the router, by pressing in the reset button in the back with a paperclip (or other such highly technical piece of equipment), until the power light blinks twice. He said it would take perhaps 15 seconds, but when I did it, it blinked twice in probably like 6 seconds, and I held it a few more seconds, and it kept blinking, but then I let go. This wound up working. I then needed to wait until it rebooted, and when it was done rebooting, the lights were to be as follows: Green power (on), green security (OFF), blue wireless (on or flashing), and green internet (on or flashing). My router did indeed come back on with this configuration, so then it was on to the next step.
Now, we need to reset the router to factory settings FROM THE TOUCHSCREEN. On the Touchscreen, click Settings. Now, we need to use the installer's code, which they probably won't let me post here, but think of the last 4 digits in the space-shuttle launch countdown... It then will ask you to enter a technician ID, and for that enter "y". We are then into the Settings menu with installer's credentials. You need to select ADVANCED SETTINGS -> CONNECTIVITY -> RESET ROUTER FROM FACTORY. This will bring up a menu that asks you a bunch of questions about how your system is set up. It first asks you if you connect directly to a cable modem, or to one of 2 kinds of routers. Select your configuration. Mine was the Netgear Router. It then asks if you want to connect your touchscreen to the "Router" or "Router with Ethernet". That means, wireless, or wired. I selected Router, meaning wireless. I think there may be a couple other prompts, but they are self-explanatory, and in the end, it re-installs whatever it needs to on the router, and then reboots itself, and then tada! It worked for me!