Toshiba has a known problem with there A series model of laptop. It has been known to set its bios password by itself. It is a simple fix, but should be done by a professional or a confident user.
If you want, this is what needs to be done. Remove the piece of plastic above the keyboard. Unscrew the 2 screws in the keyboard and lift the keyboard up( No reason to disconnect it ) Unscrew and remove the modem card in the center. There is 2 solder points c88 on the system board. You need to short those 2 points out while you press the power button on. This will reset the bios password. This should take someone about 5 minutes to do.
For instructions on how to remove the keyboard How to Remove a Toshiba Equium Keyboard | eHow.com
hope this helps