On the off chance you aren't trying to trick us for help in hacking a computer login, you might want to try a different keyboard. In case the shut down somehow fried the one that was plugged in. I'd also try the other ideas as they are good.
You already posted this question about 4 pages ago and we already responded with the exact same solutions.
Hmm tricky... there is software out there that you can obtain for free (legally) that can boot from CD and reveal your password...