Apple has kicked off a replacement program for faulty hard drives in some of its 27-inch iMac computers.
Cupertino confirmed on Friday that an unknown number of systems sold between December 2012 and September 2013 were affected by the flaw.
It said: "Apple has determined that a very small number of 3TB hard drives used in 27-inch iMac systems, may fail under certain conditions."
The iThing maker and authorised service providers will replace dodgy hard drives free of charge, it added.
Apple reminded fanbois affected by the fault to backup their data before offloading it for a replacement. ®