Macbook won't recognize keyboard – how to fix?

I have been very pleased with my Macbook thus far... I have recorded several dozen songs & printed some books from my pix... but now when my machine boots up (and sometimes it doesn't... you just hear the boot sound over & over) I get the login screen, but I can't move the mouse or hit any button at all that will be recognized, other than the power on/off. The battery also got drained inexplicably yesterday... any ideas?

Thanks!

Recent MacBook spare part searches: mac wont recognize keyboard, macbook pro wont recognize keyboard, macbook air wont recognize keyboard, mac pro wont recognize keyboard, Mac wont recognize apple keyboard, macbook doesnt recognize replacement keyboard, macbook pro starts up doesnt recognize keyboard, my apple wont recognize wireless keyboard, macbook cannot recognize keyboard, macbook air wont recognize keyboard or mouse, macbook pro doesn\t recognizekeyboard, mac wont recognize wireless keyboard, 604-0537-c, mabook won\t recognize wireless apple keyboard, logic wont recognize screen keyboard, keyboard macbook cannot detect, getting macbook to recognize keyboard, cant detect mouse macbook air, cannot detect my apple wireless keyboard, airbook can not recognize the battery, my macbook air wont recognize my bluetooth keyboard