My computer got a bonk on its head and the keyboard/mouse are not responding. External devices work (USB keyboard & mouse) and it seems to operate fine, but the built-in keyboard mouse are non responsive. I tried resetting the PRAM but no response (seems keyboard is *really* dead). I tried restarting, still didn't work. I turned it off, now it wont turn back on (power button *really* dead). I'm assuming its a hardware problem and not software? Anything else to try?