I don't know how you are getting this problem, what you see is a "power on" password. This normally occurs after a bios battery is replaced and is a security measure. I can only assume the Bios battery died on you and lost the settings.
You have a couple of options: Contact toshiba and ask them for a bios master password. You may also need one for the hard drive access as well. They will ask for proof of ownership.
You will not find any back door passwords. Even if you were to use Dogberts pass hacker (google dogberts reverse engineering), the hard drive would still probably be locked and you'd need to replace this, as if it is locked, it cannot be reformatted.
The last choice is a bit "touch and go" It may work.. it may not. I've used this on a similar laptop and it worked for me, however, this is at your own risk. At 4 years old I'd be getting a new cmos battery before doing this.Power unit off. Disconnect AC power. Remove battery. Remove the memory
cover screw, memory cover and the memory modules. Peel back the plastic sheet from
JOPEN1 solder pad. Short JOPEN1 solder pads for 30 seconds. Replace plastic sheet. Replace memory modules. Replace battery. Power up unit. Replace covers if it works.
This video explains it a bit betterhttp://ketrin.biz/?p=675