What happened to my internet?

Hi, 

Since yesterday from 13.00 I've had no internet. Only the Power and WLAN light are on. I have a 6441 router. I've turned the modem on and on, unplugged everything (the main plug, the plug from the TAE), reset etc and still the same thing. It's been over 24 hours and the internet is still not working. How can I fix the issue? 

Thanks in advance