Author Topic: Diagnosing power issue on iMac  (Read 1218 times)

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Offline ZataralosTopic starter

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Diagnosing power issue on iMac
« on: August 17, 2020, 03:57:47 am »
Hoping someone can provide some direction. I changed the EFI chip on a 2017 iMac 21.5 retina model and now it won’t boot. What I notice is that when I first plug it, in the diagnostic LED1 is on (which is good, getting power) but the second LED (LED2) starts flashing on and off every 5 seconds. This is before I press the power button (which does nothing). Machine won’t boot, no chime, no fans, nothing. Any thoughts? Could I have introduced a short somewhere? What can I check?

Thanks
 


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