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My system is Dead!Hi guys, kinda old post but still hoping to get a reply (or even a better, a solution :D). Changed the video card on an iMac ...
Answer to: iMac wont start, only diagnostic led 1 onI know its an old post but I have this problem too. I found out with removing the videocard the second led is turning on as well and the computer starts. As soon as I put back the videocard it won't do anything. Only first led is on. I saw a lot of problems with videocards in iMacs but never that the card prevented the system from starting. Its an 27 inch 2011 model.