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AMD graphics card might be malfunctioning, Apple is part of 27-inch iMac display card replacement
Apple for the 2011 to 2012 sold in 27-inch iMac replace the video card.
Apple 17 issued notice that the use of quad-core Intel Core i5 3.1GHz or 3.4GHz quad-core Intel Core i7 processor in 27-inch iMac computers equipped with the AMD Radeon HD 6970M may be failure scenarios, leading to distorted computer monitor with white or blue vertical line screen, or into a black screen. So Apple will be in May 2011 to October 2012 between the 27-inch iMac sales replace the video card.
imac 2012 vs imac 2011 665×498 AMD 顯卡可能故障，Apple 為部分 27 吋 iMac 更換顯示卡
If your 27-inch iMac in the announcement of the purchase period, but there is also the scenario described, the user can call Apple Authorized Service Provider or Apple technical support center, the submission of your iMac. If the confirmation is the AMD Radeon HD 6970M problem, but less than three years after the sale, Apple will replace graphics card.
Also, if the user has to pay maintenance or replacement under the chassis, but that is the AMD Radeon HD 6970M graphics card problem, contact Apple users can also request a refund.Viewing:-135
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