By WRAL Tech Wire

RESEARCH TRIANGLE PARK, N.C. – Lenovo has again expanded the recall on ThinkCentre PCs.

Lenovo now is voluntarily recalling 188,000 ThinkCentre M70z and ThinkCentre M90z all-in-one (AIO) desktop PCs sold worldwide between May 2010 and March 2012. Previously, the announced recall included 160,000 systems built between May 2010 and December 2011.

Lenovo has determined that due to a failure of the power supply in the affected all-in-one PCs, the system can overheat and pose a fire hazard. Lenovo has received two customer reports of fire that resulted in damage to the PC.

Lenovo recommends that you should immediately stop using the affected desktop PC, and unplug the power cord. Only certain of the ThinkCentre M90z and M70z PCs sold in this timeframe are affected, and all of the affected systems can be identified by machine type and serial number.

Lenovo is offering free power-supply replacements for all affected ThinkCentre M90z and ThinkCentre M70z all-in-one desktop PCs.

Because additional systems and manufacturing dates have been added to the recall, even those customers who previously screened their systems against this recall should re-screen their systems.

PCs that qualify can be verified by four-digit machine type and seven-digit serial number, which can be found on a label underneath the PC. To determine whether your PC is affected by this recall, visit Lenovo Support.