My son has left my think pad unplugged and RUNNING causing the battery to run flat, because of this the security lock has been activated and the COMPUTER asks for a pass word or code before it will allow us to start up the computer, as we didnt by the thinkpad new we never got an operating manual for it. can anyone tell me what code we need to enter to deactivate the lock so the comuter can start up. thanksSounds more like a bios PASSWORD, hardware level password. Is this password at a black screen or at the windows logon?

If this is at the black screen (aka post screen) you will have to locate the cmos battery to reset the bios if its before windows boots with logon password. This will require opening the laptop and disconnecting and then reconnecting the battery a few minutes later. Then it should revert back to DEFAULT of no password for system.

If its the windows password that you need, you will have to use a bootable password reset tool that you can download and burn to a CD from ISO image. Then boot the system off of that CD and then force change the password to a password such as 'password' and save changes. Then reboot system with CD removed and use 'password' as your password and then change the password to something that cant be easily hacked in seconds.On most laptops REMOVING the CMOS battery will not re-set the password default prompt...

You will need to take it to an authorised repair center....be prepared to show proof of ownership. Quote

My son has left my think pad unplugged and running causing the battery to run flat, because of this the security lock has been activated