Black Screen

I got a Bush monitor for Christmas for my new computer (my PC is a custom built gaming PC) so i went to play Star Wars The Old Republic and i was seeing what settings i could have and i put the refresh rate up to 100 and it went black and i didn't want to wait so i hit ESC and it stayed black so every time i sign into windows 7 it goes black and i know this is star wars because one day i tried the monitor and star wars had an update but as soon as the update was done it went black please help :)