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27 5k - EFI Chip faulty - how to solve this?

iMac 27 5k late 2015 won’t power on as EFI chip fault. I can’t find the advise about this on online, can you advise me how to solve this- do I need to replace - what I need to do or can it fix? Thank you

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Why do you think this is an EFI issue?

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