Press and hold down the (Power) button for more than four seconds and check if the power indicator light is off. Then, restart your VAIO computer and enter the correct password.

The password is case-sensitive, so be sure to check letters for the current case before you enter the password.

If you forget the power-on password, you cannot start your VAIO computer. See What should I do if I forget the power-on password to start my VAIO computer? for more information.