I have this problem. I am able to type in my login password & login but there after my keyboard will not enter anything. Mouse & track pad work OK. I have read many topics in this regard but not quite like mine. Lots of help given include using the keyboard to get to various parts but I cannot even reload OS as I need to use my password to do so, which brings us back to the problem!!! I cannot type anything in any box on any thing. Sometimes I even get the circle of death and can only shut down with the power switch. That is never a good thing is it? Any help would be most appreciated as I am a Mac newbie. Yours sincerely Matthew.