THE Toshiba web site has the following notice about power on password:
A "Password =" prompt may be displayed when the computer is turned on, even though no power-on password has been set. If this happens, there is no password that will satisfy the password request. The computer will be unusable until this problem is resolved.
If the problem has not happened yet, verify that your computer has the BIOS currently available from the Toshiba Support website. See detailed instructions below.
Your computer's BIOS may already include the fix for this problem, depending upon the model, and when it was manufactured.
This Support Bulletin is not a notice of a new BIOS for your computer; it's a notice that the password prompt problem has been fixed in relatively new BIOS releases.
The occurrence of this problem on any particular computer is unpredictable -- it may never happen, but it could happen any time that the computer is turned on. If this problem does occur, it will be necessary to send the computer to a Toshiba Authorized Service Provider.
The resolution is to send the laptop to Toshiba.