psn connection problem.

i bought a few games from the PSN store and been downloading them with no problems the past week...yesterday i wanted to finish downloading my last game and now i cant enter psn. It stuck on "signing in", and in the end it always fails. I then went to check my internet connection in the console and it seems i fail to get ip adress. I didn't touched my internet connection, everything is the same as it always was, so what's the problem? :\