Q: No connection to internet

I recently bought this new router, model NETGEAR DGN2200v3, and at first everything was O.K. and I could connect to internet. Then, I suddenly lost internet connection and a exclamtion mark appears on the Wi-Fi sign. There I could see that there was perfect signal to my wireless network, however, no internet access. It self-assigns a IP adress and I know that when it stars with 169 there is no intertet connection. I have researched on forums and I have tryed everything I thought that it could make it work again: turning off and back on the router, run the "Assist me" button, change the DNS, and even tryed to make it "forget" the network and set it again but nothing works. I have ran out ideas. Help please!