nothing else has worked even the post on here for it

my question: What can i do the change minecraft from saying "can't reach server"?

because this is very frustrating, I've tried the port forwarding (not sure if I have done that correctly), I've checked to see if the firewall was blocking it but it wasn't even on to block it, and I have tried other forums and nothing is working. I am beyond frustrated now. Can anybody set by step help me. I have a Linksys internet connection, WRT54G is the model number. Running on Windows 7.

Thanks for any furture help!!!