Lenovo has expanded a recall of two all-in-one desktop PC models due to a fire hazard.

The number of recalled machines totals 63,500 with the additional recall of 13,000 announced Tuesday. The first recall  of machines was announced in March.

ThinkCentre M70z and M90z Computers were imported by Lenovo nd sold online at Lenovo’s websites, by telephone and direct sales through Lenovo authorized distributors nationwide from May 2010 through March 2012.

The hazard is posed by an internal component in the power supply that can overheat, posing a fire threat.

The all-in-one desktop computers, or PCs, are flat-panel monitors with the PC integrated into the monitor housing. The power supplies are also inside the monitor or PC housing. The computer chassis has a matte black finish with the brand name “ThinkCentre” in the lower left hand corner of the monitor front. The computers were manufactured in Mexico.

Lenovo, the world’s No. 2 PC manufacturer, operates its global executive headquarters in Morrisville.

For recall information, call Lenovo at  855-248-2194 or visit the recall website: http://www.lenovo.com/aiopsurecall