Hi J Johnson.
Welcome to the forum. Sorry your first post here is for a problem, please could you tell us which model of camera you have the problem on. There are people here with in depth knowledge of most models, but I fear you may have answered your own question, a trip to canon may well be in order. There was recently a post detailing how to re install a firmware version, though I don't think you will get far if you can't get into the menu!