When you replace the system board, you must set the UUID on the new system
board as follows:
1. Install the ThinkPad Hardware Maintenance Diskette Version 1.73 or later, and
restart the computer.
2. From the main menu, select 4. Assign UUID.

A new UUID is created and written. If a valid UUID already exists, it is not

overwritten.

60 ThinkPad T500 and W500 Hardware Maintenance Manual