Apple has determined that certain 1TB Seagate hard drives used in 21.5 inch and 27 inch iMacs may fail. These systems were sold between October 2009 and July 2011. As an Apple Authorized Service Provider, we can replace this hard drive for you under the iMac 1 TB Seagate Hard Drive Replacement Program. No appointment necessary or waiting in line. Call us a 203.874.1468 or email us at schedule@trmacs.com