Forget password or computer can not except it.

Problem:
One user ask my that my Computer can not excep user Password.

Solution:
I check keyboard Numlook key LED it was no blanking and check mouse it was no responding.
So First I do that power off computer by pressing power button for few seconds. When computer completely power off then I check all cable connection and Start the computer, now keyboard and mouse perfectly working and except the user password.