Apple has launched a replacement program for the graphics card in some mid–2011 iMac configurations, reports 9to5Mac. According to a note sent to Apple Support employees, the AMD Radeon HD 6970 video cards in some 27-inch May 2011 iMacs have experienced issues, causing them to fail. Apple has determined that some AMD Radeon HD 6970M video cards used in 27-inch iMac computers with 3.1GHz quad-core Intel Core i5 or 3.4GHz quad-core Intel Core i7 processors may fail, causing the computer’s display to appear distorted, white or blue with vertical lines, or to turn black. iMac computers
