F1 key to fix dead keyboard on boot u

windows vista all of sudden got keyboard no responding on boot up and POST was fine, the solution is like this:
1. connect the laptop to a usb keyboard after turned it off
2. turn back on while keep hitting F1 key
3. until the initializing interface shows up, release the F1 key and pressing the enter key.
4.  when you see the cursor blinking, turn the pc off 
5. turn the pc back on, wait the machine getting into the OS.
done