I replaced a dead fan on an IBM T23 Think Pad, type 2647. To do so requires removal of the backup battery, per IBMs field manual.
After putting it all back together, the system now requires a boot password.
No password was EVER set by the user so no password is known to put in.
It appears pulling the cmos battery reset the BIOS as expected but now it thinks there is a password.
I have tried removing the batteries again and booting from AC with no luck
Any ideas? IBM says the only way is to replace the motherboard.