Lenovo is recalling numerous ThinkCentre M70z and M90z all-in-one desktop systems PCs sold between May 2010 and January 2012. Lenovo has determined that due to a failure of the power supply in the affected all-in-one PCs, the system can overheat posing a fire hazard. For more info contact Lenova Support;
Lenovo toll-free Hotline (855) 248 2194 or visit www.lenovo.com/aiopsurecall.

Consumer Product Safety Commision:  
http://www.cpsc.gov/cpscpub/prerel/prhtml12/12129.html

Read these Articles for further details:
http://www.pcworld.com/article/251531/lenovos_firehazard_pc_recall_faq.html

http://www.eweek.com/c/a/Desktops-and-Notebooks/Lenovo-Recalls-50500-ThinkCentre-PCs-for-Fire-Hazard-385676/

http://www.msnbc.msn.com/id/46671120/ns/technology_and_science-security/t/more-lenovo-pcs-recalled-fire-risk/