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Model A1418 / Late 2013 / 2.7 & 2.9 GHz Core i5 or 3.1 GHz Core i7 Processor

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iMac stuck in boot loop and does not recognize keyboard.

After pushing the on button it takes 15-20 seconds before the chime, and the apple/progress bar appears (on a black screen). Then at the end of progress bar it shuts off and reboots. It will not recognize any keyboard. I have tried multiple keyboards, wired and wireless, apple and non apple, none will connect. Without a keyboard I can’t use any shortcuts to reset anything, or get into target mode (which is what I am wanting to do, so I can clone it from another iMac). Any help would be much appreciated.

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What is your drive config? Do you have a Fusion drive or a discreet SATA HDD or PCIe blade SSD?

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It has a SATA HDD.

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Sounds like your logic board has failed! If you can’t get a keyboard to work (Bluetooth or USB) you’ll need to replace the logic board to salvage the system

If you are trying to recover your data the type of drive configuration you have will have a bearing on how to get to your data.

One option is to open the system removing the drive and putting the drive into an external drive case.

Update (03/06/2019)

Since you have a SATA drive you could remove it following this guide iMac Intel 21.5" EMC 2638 Hard Drive Replacement then you could use this adapter StarTech 2.5" SATA to USB adapter cable or a 2.5in USB 3.0 SSD SATA Hard Drive Enclosure

I would recommend you use Disk Utility and install a fresh copy of OS on your target drive then use Migration Assistant to move your account, apps & files over Vs any cloning software.

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