A:Answer The first step I would try is reading this page on the Lenovo support page...
https://support.lenovo.com/us/en/documents/ht036206
so under Power On password ....
If the Power-on passowrd is forgotten and no Supervisor password set, try the following:
Turn off the computer.
Remove the battery pack.
Remove the backup battery. For instructions on how to remove the backup battery, click here.
Turn on the computer and wait until the POST ends.
After the POST ends, the password prompt does not appear.
The POP has been removed.
Reinstall the backup battery and the battery pack.