Problems logging in

Okay, so I posted earlier and I believe my issue was resolved because I was able to load up the wp-admin and even publish a post, but for some reason I am not able to log on now.

Instead of going to the log in page says that Safari (using a mac) cannot find the server.

What could possibly be going on and how do I fix it? I already tried deleting my history and cookies, but that didn’t seem to work.