2 
1 Unit will not fully boot.
I’ve tested multiple hardrives with known working partitions.
i’ve swapped out the hardrive cable with a new functional cable.
tested the hardrive on separate macs, and they work fine.
I’ve performed a Pram reset and reset the SMC to no avail.
It passed multiple extended hardware tests.
It has no peripherals connected and isolated further by removing the non essential components, Airport/diskbay.
And i legitamitly have ran out of ideas.
any thoughts are welcome…
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368 
does it work with a USB to SATA adapter?
из mayer
It will not boot to externals or recovery mode.
из Jared Owens