ok....ive tried to reboot my internet ive turned off my ps3 ive unpluged everything and i still cant log in because "sony entertainment network timed out"....its been like this for over a week.im about to get rid of my **bleep** ps3
Have you tried adding a Static IP Address to your PS3 and adding Ports to your router? also have you considered that it may'be your service provider?
EDIT: Have you reset your router and modem? Because sometimes turning it off won't solve problems.