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Can i use the cpu lga 1150 for desktop i7 4790 to replace for the factory’s cpu. Please reply to me soon. When i removed the display to upgrade. After that, i have a hardware problem, can i use apple care or not Thanks all

First review this IFIXIT guide: iMac Intel 27" EMC 2639 CPU Replacement. While it is possible to remove it is not something I would recommend as the difference between the i5 and i7 chips is not enough gain given the risks here. Apple marks the chip with a seal so if you do replace it, Apple will not offer warranty for your system! Your AppleCare service agreement is also voided! I also must warn you the newer ‘Thin Series’ iMac’s are a bear to open if you don’t use the correct tools and follow the IFIXIT guides to the letter you will likely damage your display which would be an expensive error! Bottom line here: Don’t do it its not worth it!

Unfortunately no. The desktop version of the i7 4790 is different from the one installed in your iMac. All apple computers uses a M version of the processor which are smaller and from what I know non-upgradeable. If you have AppleCare, they will see you have opened the iMac, but they should be able to help. They’ll charge a certain fee, but at least your computer will be working again! Good luck!

Yes its possible to do… check this out http://forums.macrumors.com/threads/imac