You can read Lenovo's recall information page for all the details of the recall. A tool on the page lets you plug in your machine code and serial number to find out if you have an affected unit. The M90z is a different unit than the
Lenovo markets the ThinkCentre line to business customers, although it is available for anyone to purchase. Lenovo says it sold the at-risk systems between May 2010 and January 2012.
If you are at risk for a flaming all-in-one, Lenovo advises you to immediately unplug your desktop. Once you submit that you have an affected unit, Lenovo says it will ship out a replacement power supply for free.