No response when power button is pressed.
I have recently acquired a 2017 21.5” iMac which is dead. Only 1 of the diagnostic LEDs are on, so I changed the PSU and it's still the same. I have disconnected all (but the PSU connections, tried an SMC reset, drained all the power and took the Logic Board out and gave it a visual inspection but now I've ran out of ideas. I assume it's likely a board level repair but I was just wondering if any of you gurus on here have any ideas, or obvious solutions?
Any help would be greatly appreciated.
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