Lenovo has announced that it is voluntarily recalling 160,000 of its ThinkCentre M70z and M90z all-in-one PCs owing to concerns over a fire-prone power supply. The units involved were originally sold between May 2010 and January 2012, and although nobody has been injured, two of the computers have shown the fault, with one producing flames and the other smoking. The affected units aren't confined to one particular sales channel — Lenovo says that users could have bought the AIO online, over the phone, or through one of its partners — but has said that owners should immediately stop using the PC, unplug the PSU, and contact it to schedule a replacement.