|Well, there are a couple different passwords that the T43 has. A power on password, supervisor password, and a hard drive password. |
If it's the power on password, like you hit the power button and then there's a password, you are in luck.
You will have to remove the primary battery, AC adapter, and CMOS battery. Hold the power button for like 5 seconds to drain any charge. Now put it back together and see if it works.
Here's a video i found for you http://support.lenovo.com/en_US/det...
If it's your supervisor password there are some people that have the key gen that sell it on ebay. I have used these services on some computers.
Let us know if this works for you