1 computer not seeing anything

Hey guys,
I’ve been using wordpress for about a year now. I run blindpodcaster.com. Tuesday April 15, 2014, I logged in as usual and updated a few plugins. One of these plugins was themed or themes security ( I don’t remember which) while it was trying to download the progress bar at the top didn’t move and forced shut safari. I waited and tried to log back in and nothing happens on my mac book pro early 2011. I called my hosting company and they said that everything was fine on their end. I confirmed this by logging in from another computer and sure enough I’m able to get into the backend and fronted of my site without any problems from other computers, just not my macbook pro.
What do I need to do to fix this? I’m blind so I may need someone’s help as I’m a podcaster and musician first and tech geek second and don’t know a lot about code. Thanks for any help anybody can give me.