monitor buttons not working

Hi everyone this is my first post. My monitor screwed up for no apparent reason. I have followed all guidelines to try to reset it, by the way, the reset button does not work on the monitor, when ever I push it a green key symbol comes up in the left hand corner. when I press the menu button on the monitor the menu pops up with Japanese writing....what happened??? I tried talking to Dell tech. but with the outsourcing of American jobs there seemed to be a language barrier and after explaining the situation for 20 minutes I am afraid they still had no idea what I was talking about. No offense to anyone is meant it is just so frustrating! None of the buttons work, my screen is slightly dark and crooked and blurry. Does anyone have any idea what that darned green key symbol means and how to fix it? Thanks for any help you can give.:4-dontkno