Enter Administrator password or power on password

I have a Pavillion 6b75nr.  I get the "enter administrator password or power password" blue message on the black screen. There is no error code given.  In fact, most of the keys but a few do not work.  It will not allow me to type on some of the keys, and when it does allow me to type them in, it will start giving me beeping sounds.  Please help before I use this as target practice