There is a new version of M90z system BIOS and Embedded Controller available for ThinkCentre M90z systems.
The above symptom is associated with, but not limited to, the following systems:
System is configured with:
Lenovo recommends that end users update their ThinkCentre M90z systems to the latest version of system BIOS and Embedded Controller. Lenovo Engineering has identified an issue related to system board corruption after a sudden power loss to the system (from the building wall power). These two updates will prevent this corruption issue from occurring if power is suddenly removed from the system.
Users should update their system to BIOS version 9BKT41A or greater before installing the new Embedded Controller firmware version 9BCT34A, or greater. Follow the instructions below to update the BIOS and then the Embedded Controller firmware:
The Embedded Controller version can be verified in the BIOS setup screen.