iMac booting stuck on grey screen

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Tried everything, but still not able to boot my iMac and macbook pro (they BOTH have the exact same issue, at the exact same, after installing macOS Sierra on a clean disk).

– Disk repair
– NVRAM reset
– SMC reset
– Erase disk and re-install Sierra: Installer finished successfully, after reboot the same grey screen
– Erase disk and re-install El Capitan: Installer finished successfully, after reboot the same grey screen
– Safe mode sometimes works, but can’t find relevant log files
– Replaced the HDD with a new one, still same issue

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